diff --git a/.github/workflows/dockerextbuild.yml b/.github/workflows/dockerextbuild.yml
new file mode 100644
index 000000000..466fcfbe6
--- /dev/null
+++ b/.github/workflows/dockerextbuild.yml
@@ -0,0 +1,119 @@
+# This is a workflow to compile the cmeps source without cime
+name: extbuild
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push
+#  :
+#    branches: [ master ]
+#  pull_request:
+#    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  build-cmeps:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        openmpi: [4.1.2]
+        hdf5: [1.12]
+        netcdfc: [4.8.1]
+        netcdff: [4.5.4]
+        pnetcdf: [1.12.3]
+    env:
+      CC: mpicc
+      FC: mpifort
+      CXX: mpicxx
+      CPPFLAGS: "-I/usr/include -I/usr/local/include"
+      # Versions of all dependencies can be updated here
+      ESMF_VERSION: jedwards/pio_update2
+      # PIO version
+      PIO_VERSION: pio2_5_6
+
+    container:
+      image: jedwards4b/o${{ matrix.openmpi }}h${{ matrix.hdf5 }}nc${{ matrix.netcdfc }}nf${{ matrix.netcdff }}p${{ matrix.pnetcdf }}
+      options: --user 1001
+    steps:
+      - name: checkout cmeps
+        uses: actions/checkout@v3
+        with:
+          path: components/cmeps
+      - name: checkout cmake_fortran_utils
+        uses: actions/checkout@v3
+        with:
+          repository: CESM-Development/CMake_Fortran_utils
+          path: build/CMake_Fortran_utils
+      - name: Checkout PIO
+        uses: actions/checkout@v3
+        with:
+          repository: NCAR/ParallelIO
+          ref: ${{ env.PIO_VERSION }}
+          path: ParallelIO
+      - name: Checkout ESMF
+        uses: actions/checkout@v3
+        with:
+          repository: esmf-org/esmf
+          ref: ${{ env.ESMF_VERSION }}
+          path: ESMF
+      - name: Checkout genf90
+        uses: actions/checkout@v3
+        with:
+          repository: ParallelIO/genf90
+          path: build/genf90
+      - name: Cache PIO
+        id: cache-PIO
+        uses: actions/cache@v2
+        with:
+          path: ParalleIO
+          key: ${{ runner.os }}-${{ env.PIO_VERSION }}.pio
+
+      - name: build PIO
+        if: steps.cache-PIO.outputs.cache-hit != 'true'
+        run: |
+          cd build
+          export PATH=/usr/local/bin:$PATH
+          cmake -Wno-dev \
+          -DCMAKE_INSTALL_PREFIX=${GITHUB_WORKSPACE}/pio \
+          -DGENF90_PATH=${GITHUB_WORKSPACE}/build/genf90 \
+          -DNetCDF_PATH=/usr/local/ \
+          -DPnetCDF_PATH=/usr/local \
+          -DPIO_ENABLE_FORTRAN=ON \
+          -DPIO_ENABLE_TIMING=Off \
+          ../ParallelIO
+          make VERBOSE=1
+          make install
+
+      - id: cache-esmf
+        uses: actions/cache@v2
+        with:
+          path: esmf
+          key: ${{ runner.os }}-${{ env.ESMF_VERSION }}-ESMF
+      - name: build ESMF
+        if: steps.cache-esmf.outputs.cache-hit != 'true'
+        env:
+          ESMF_COMPILER: gfortran
+          ESMF_BOPT: g
+          ESMF_PIO: external
+          ESMF_PIO_INCLUDE: ${GITHUB_WORKSPACE}/pio/include
+          ESMF_PIO_LIBPATH: ${GITHUB_WORKSPACE}/pio/lib
+          ESMF_NETCDF: nc-config
+          ESMF_PNETCDF: pnetcdf-config
+          ESMF_COMM: openmpi
+          ESMF_INSTALL_PREFIX: esmf
+        run: |
+          cd ESMF
+          export ESMF_DIR=`pwd`
+          echo $ESMF_DIR
+          make -j 2
+          make install
+
+      - name: Build CMEPS
+        env:
+          ESMFMKFILE: ${GITHUB_WORKSPACE}/esmf/lib/libg/Linux.gfortran.64.openmpi.default/esmf.mk
+          PIO: ${GITHUB_WORKSPACE}/pio
+        run: |
+          mkdir build-cmeps
+          cd build-cmeps
+          cmake -DCMAKE_BUILD_TYPE=DEBUG -DCMAKE_Fortran_FLAGS="-g -Wall -ffree-form -ffree-line-length-none" ../components/cmeps
+          make VERBOSE=1
+          
diff --git a/.github/workflows/dockersrt.yml b/.github/workflows/dockersrt.yml
new file mode 100644
index 000000000..5d916ffe4
--- /dev/null
+++ b/.github/workflows/dockersrt.yml
@@ -0,0 +1,129 @@
+# CIME scripts regression tests
+
+name: scripts regression tests
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push
+#  :
+#    branches:  main 
+#  pull_request:
+#    branches:  main 
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        mpich: [4.0.1]
+        hdf5: [1.12]
+        netcdfc: [4.8.1]
+        netcdff: [4.5.4]
+        pnetcdf: [1.12.3]
+    env:
+      CC: mpicc
+      FC: mpifort
+      CXX: mpicxx
+      CPPFLAGS: "-I/usr/include -I/usr/local/parallel/include"
+      # Versions of all dependencies can be updated here
+      PARALLELIO_VERSION: pio2_5_6
+      ESMF_VERSION: jedwards/pio_update2
+      CIME_MODEL: cesm
+    container:
+      image: jedwards4b/m${{ matrix.mpich }}h${{ matrix.hdf5 }}nc${{ matrix.netcdfc }}nf${{ matrix.netcdff }}p${{ matrix.pnetcdf }}
+
+  # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: cime checkout
+        uses: actions/checkout@v3
+        with:
+          repository: ESMCI/cime
+
+      - name: share checkout
+        uses: actions/checkout@v3
+        with:
+          repository: ESCOMP/CESM_share
+          path: share
+
+      - name: cpl7 checkout
+        uses: actions/checkout@v3
+        with:
+          repository: ESCOMP/CESM_CPL7andDataComps
+          path: components/cpl7
+
+      - name: mct checkout
+        uses: actions/checkout@v3
+        with:
+          repository MCSclimate/MCT
+          path: libraries/mct
+
+      - name: parallelio checkout
+        uses: actions/checkout@v3
+        with:
+          repository NCAR/ParallelIO
+          path: libraries/parallelio
+
+      - name: Cache inputdata
+        id: cache-inputdata
+        uses: actions/cache@v2
+        with:
+          path: $HOME/cesm/inputdata
+          key: inputdata
+
+      - name: Checkout ESMF
+        uses: actions/checkout@v3
+        with:
+          repository: esmf-org/esmf
+          ref: ${{ env.ESMF_VERSION }}
+          path: ESMF
+
+      - id: cache-esmf
+        uses: actions/cache@v2
+        with:
+          path: esmf
+          key: ${{ runner.os }}-${{ env.ESMF_VERSION }}-ESMF
+      - name: build ESMF
+        if: steps.cache-esmf.outputs.cache-hit != 'true'
+        env:
+          ESMF_COMPILER: gfortran
+          ESMF_BOPT: g
+          ESMF_PIO: external
+          ESMF_PIO_INCLUDE: ${GITHUB_WORKSPACE}/pio/include
+          ESMF_PIO_LIBPATH: ${GITHUB_WORKSPACE}/pio/lib
+          ESMF_NETCDF: nc-config
+          ESMF_PNETCDF: pnetcdf-config
+          ESMF_COMM: openmpi
+          ESMF_INSTALL_PREFIX: esmf
+        run: |
+          cd ESMF
+          export ESMF_DIR=`pwd`
+          echo $ESMF_DIR
+          make -j 2
+          make install
+#
+#      The following can be used to ssh to the testnode for debugging
+#      see https://github.com/mxschmitt/action-tmate for details
+#      - name: Setup tmate session
+#        uses: mxschmitt/action-tmate@v3
+
+      - name: scripts regression tests
+        run: |
+          mkdir -p ${HOME}/cesm/scratch
+          mkdir -p ${HOME}/cesm/inputdata
+          cd ${HOME}/work/CESM_share/CESM_share/scripts/tests
+          ls -l $HOME/work/CESM_share/CESM_share
+          export NETCDF=/usr/local/parallel
+          export PATH=$NETCDF/bin:$PATH
+          export LD_LIBRARY_PATH=$NETCDF/lib:$HOME/pnetcdf/lib:$LD_LIBRARY_PATH
+          ./scripts_regression_tests.py  --no-fortran-run --compiler gnu --mpilib mpich --machine ubuntu-latest
+
+#     the following can be used by developers to login to the github server in case of errors
+#     see https://github.com/marketplace/actions/debugging-with-tmate for further details
+#      - name: Setup tmate session
+#        if: ${{ failure() }}
+#        uses: mxschmitt/action-tmate@v3
diff --git a/cime_config/buildexe b/cime_config/buildexe
index f2a0c905c..e331f4c0e 100755
--- a/cime_config/buildexe
+++ b/cime_config/buildexe
@@ -105,7 +105,7 @@ def _main_func():
     if os.path.isfile(exename):
         os.remove(exename)
 
-    cmd = "{} exec_se -j {} EXEC_SE={} MODEL=driver {} -f {} "\
+    cmd = "{} exec_se -j {} EXEC_SE={} CIME_COMP=driver {} -f {} "\
         .format(gmake, gmake_j, exename, gmake_args, makefile)
 
 
diff --git a/cime_config/config_component.xml b/cime_config/config_component.xml
index aeb7770fc..cc049dd86 100644
--- a/cime_config/config_component.xml
+++ b/cime_config/config_component.xml
@@ -17,6 +17,15 @@
     <desc>List of component classes supported by this driver</desc>
   </entry>
 
+  <entry id="CONTAINER_ENVIRONMENT">
+    <type>char</type>
+    <valid_values></valid_values>
+    <default_value></default_value>
+    <group>case_comp</group>
+    <file>env_case.xml</file>
+    <desc>Container environment to invoke, if any</desc>
+  </entry>
+
   <entry id="COMP_CPL">
     <type>char</type>
     <valid_values>cpl</valid_values>
@@ -648,7 +657,7 @@
     <group>build_def</group>
     <file>env_build.xml</file>
     <desc>Output root directory for each machine.
-                Base directory for build and run directories.
+		Base directory for build and run directories.
     </desc>
   </entry>
 
@@ -997,9 +1006,9 @@
     <file>env_run.xml</file>
     <desc>
       Determines what ESMF log files (if any) are generated when
-          USE_ESMF_LIB is TRUE.
+	  USE_ESMF_LIB is TRUE.
       ESMF_LOGKIND_SINGLE: Use a single log file, combining messages from
-          all of the PETs. Not supported on some platforms.
+	  all of the PETs. Not supported on some platforms.
       ESMF_LOGKIND_MULTI: Use multiple log files -- one per PET.
       ESMF_LOGKIND_NONE: Do not issue messages to a log file.
       By default, no ESMF log files are generated.
@@ -1040,8 +1049,8 @@
     <group>run_flags</group>
     <file>env_run.xml</file>
     <desc>Turns on component barriers for component timing.
-          This variable is for testing and debugging only and should never
-          be set for a production run.
+	  This variable is for testing and debugging only and should never
+	  be set for a production run.
     </desc>
   </entry>
 
@@ -1249,7 +1258,7 @@
     <group>run_domain</group>
     <file>env_run.xml</file>
     <desc>Latitude of grid location, in single column mode interpolate datasets to this location
-          in single point mode assume all datasets are at this location</desc>
+	  in single point mode assume all datasets are at this location</desc>
   </entry>
 
   <entry id="PTS_LON">
@@ -1258,7 +1267,7 @@
     <group>run_domain</group>
     <file>env_run.xml</file>
     <desc>Longitude of grid location, in single column mode interpolate datasets to this location
-          in single point mode assume all datasets are at this location</desc>
+	  in single point mode assume all datasets are at this location</desc>
   </entry>
 
   <entry id="PTS_DOMAINFILE">
@@ -1267,10 +1276,10 @@
     <group>run_domain</group>
     <file>env_run.xml</file>
     <desc>used only if if PTS_LAT and PTS_LON are greater than or
-          equal to 0.  If this is the case then if PTS_DOMAINFILE is not
-          equal to UNSET a nearest neighbor search of PTS_DOMAINFILE using
-          PTS_LAT and PTS_LON will be done and the component mesh will have
-          this nearest neighbor value. </desc>
+	  equal to 0.  If this is the case then if PTS_DOMAINFILE is not
+	  equal to UNSET a nearest neighbor search of PTS_DOMAINFILE using
+	  PTS_LAT and PTS_LON will be done and the component mesh will have
+	  this nearest neighbor value. </desc>
   </entry>
 
   <!-- ======================================================================= -->
@@ -1955,7 +1964,7 @@
     <desc>pio rearranger communication max pending requests (io2comp) :
        -2 implies that CIME internally calculates the value ( = 64),
        -1 implies no bound on max pending requests
-        0 implies that MPI_ALLTOALL will be used
+	0 implies that MPI_ALLTOALL will be used
     </desc>
   </entry>