Fix ccache for alpine and msan

Declare CC/CXX through the ccache action.

Closes GH-21286

.github/actions/ccache/action.yml

@@ -5,6 +5,12 @@ inputs:
   php_directory:
     required: false
     default: '.'
+  cc:
+    required: false
+    default: 'gcc'
+  cxx:
+    required: false
+    default: 'g++'
 runs:
   using: composite
   steps:
@@ -29,5 +35,5 @@ runs:
     - name: Export CC/CXX
       shell: bash
       run: |
-        echo "CC=ccache gcc" >> $GITHUB_ENV
-        echo "CXX=ccache g++" >> $GITHUB_ENV
+        echo "CC=ccache ${{ inputs.cc }}" >> $GITHUB_ENV
+        echo "CXX=ccache ${{ inputs.cxx }}" >> $GITHUB_ENV

.github/workflows/test-suite.yml

@@ -76,14 +76,14 @@ jobs:
         uses: ./.github/actions/ccache
         with:
           name: "${{ github.job }}"
+          cc: clang-20
+          cxx: clang++-20
       - name: ./configure
         uses: ./.github/actions/configure-alpine
         with:
           configurationParameters: >-
             CFLAGS="-fsanitize=undefined,address -fno-sanitize=function -DZEND_TRACK_ARENA_ALLOC"
             LDFLAGS="-fsanitize=undefined,address -fno-sanitize=function"
-            CC=clang-20
-            CXX=clang++-20
             --enable-debug
             --enable-zts
           skipSlow: true # FIXME: This should likely include slow extensions
@@ -708,10 +708,10 @@ jobs:
         uses: ./.github/actions/ccache
         with:
           name: "${{ github.job }}"
+          cc: clang
+          cxx: clang++
       - name: ./configure
         run: |
-          export CC=clang
-          export CXX=clang++
           export CFLAGS="-DZEND_TRACK_ARENA_ALLOC"
           ./buildconf --force
           # msan requires all used libraries to be instrumented,