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