change env var by writing to GITHUB_ENV

Author: Joseph Finnegan

.github/workflows/github-ci.yml

@@ -90,7 +90,7 @@ jobs:
       run: |
         if [ $(cat $TESTSUITE_RUNNING_STATUS_LOC) = RUNNING ] ; then exit 1; fi
         echo RUNNING > $TESTSUITE_RUNNING_STATUS_LOC
-        echo "true" >> $TESTSUITE_STATUS_CHANGED_DURING_RUN
+        echo "$TESTSUITE_STATUS_CHANGED_DURING_RUN=true" >> $GITHUB_ENV
         echo "set status is $TESTSUITE_STATUS_CHANGED_DURING_RUN"
         cd build/apps/modem
         JLinkExe -SelectEmuBySN 770821797 -CommandFile jlink-flash-full.script > flashOutput1.txt