Merge r1921311 from trunk: [RTC exception for CI]

CI: Use the image version in the cache keys. This is likely a simpler
and more robust fix for the issues with Perl XS builds being cached.
Root cause was likely "ubuntu-latest" changing from 22.04 to 24.04.
Cache keys will now change when that happens again, preventing reuse
of cached builds across OS versions.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1921330 13f79535-47bb-0310-9956-ffa450edef68

.github/workflows/linux.yml

@@ -247,10 +247,14 @@ jobs:
       CONFIG: ${{ matrix.config }}
     name: ${{ matrix.name }}
     steps:
+    # JOBID is used in the cache keys, created here as a hash of all
+    # properties of the environment, including the image OS version,
+    # compiler flags and any job-specific properties.
     - name: Set environment variables
       run: |
         echo "${{ matrix.env }}" >> $GITHUB_ENV
-        echo JOBID=`echo "${{ matrix.notest-cflags }} ${{ matrix.env }} ${{ matrix.config }}'"| md5sum - | sed 's/ .*//'` >> $GITHUB_ENV
+        echo JOBID=`echo "OS=$ImageOS ${{ matrix.notest-cflags }} ${{ matrix.env }} ${{ matrix.config }}" \
+           | md5sum - | sed 's/ .*//'` >> $GITHUB_ENV
     # https://github.com/actions/runner-images/issues/9491#issuecomment-1989718917
     - name: Workaround ASAN issue in Ubuntu 22.04
       run: sudo sysctl vm.mmap_rnd_bits=28