github: move svm gate to JDK latest

Author: zapster

.github/workflows/main.yml

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # The Universal Permissive License (UPL), Version 1.0
@@ -76,6 +76,7 @@ concurrency:
 
 env:
   JAVA_HOME: ${{ github.workspace }}/jdk
+  TOOLS_JAVA_HOME_LOCATION: ${{ github.workspace }}/tools-jdk
   LANG: en_US.UTF-8
   MX_GIT_CACHE: refcache
   MX_PATH: ${{ github.workspace }}/mx
@@ -111,7 +112,8 @@ jobs:
               PRIMARY: "espresso"
           # /substratevm
           - env:
-              JDK_VERSION: "21"
+              JDK_VERSION: "latest"
+              TOOLS_JDK_VERSION: "21"
               GATE_TAGS: "style,fullbuild"
               PRIMARY: "substratevm"
           - env:
@@ -189,6 +191,11 @@ jobs:
       run: |
         mkdir jdk-dl
         ${MX_PATH}/mx --java-home= fetch-jdk --jdk-id labsjdk-ce-${JDK_VERSION} --to jdk-dl --alias ${JAVA_HOME}
+    - name: Fetch Tools JDK
+      env: ${{ matrix.env }}
+      if: ${{ matrix.env.TOOLS_JDK_VERSION != '' }}
+      run: |
+        ${MX_PATH}/mx --java-home= fetch-jdk --jdk-id labsjdk-ce-${TOOLS_JDK_VERSION} --to jdk-dl --alias ${TOOLS_JAVA_HOME_LOCATION}
     - name: Update dependency cache
       if: ${{ env.MX_RUNS_DEBUG == 'true' || env.MX_RUNS_STYLE == 'true' }}
       run: sudo apt update
@@ -217,7 +224,7 @@ jobs:
       run: rm -rf .git
     - name: Build GraalVM and run gate with tags
       env: ${{ matrix.env }}
-      run: ${MX_PATH}/mx --primary-suite-path ${PRIMARY} --java-home=${JAVA_HOME} gate --strict-mode ${{ matrix.env.GATE_OPTS }} --tags ${GATE_TAGS}
+      run: ${MX_PATH}/mx --primary-suite-path ${PRIMARY} --java-home=${JAVA_HOME} --tools-java-home=${{ matrix.env.TOOLS_JDK_VERSION != '' && env.TOOLS_JAVA_HOME_LOCATION || '' }} gate --strict-mode ${{ matrix.env.GATE_OPTS }} --tags ${GATE_TAGS}
       if: ${{ matrix.env.GATE_TAGS != '' }}
     - name: Build GraalVM and run gate without tags
       env: ${{ matrix.env }}