Update main.yml

Author: dktapps

.github/workflows/main.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     name: Tests (PHP ${{ matrix.php }}, Valgrind ${{ matrix.valgrind }}, Debug=${{ matrix.debug }}, ZTS=${{ matrix.zts }})
     strategy:
@@ -41,7 +41,7 @@ jobs:
         id: php-build-cache
         with:
           path: ${{ github.workspace }}/php 
-          key: php-${{ matrix.php }}-debug-${{ matrix.debug }}-valgrind-${{ matrix.valgrind }}-zts-${{ matrix.zts }}-generic
+          key: php-${{ matrix.php }}-debug-${{ matrix.debug }}-valgrind-${{ matrix.valgrind }}-zts-${{ matrix.zts }}-ubuntu-22.04
 
       - name: Install PHP build dependencies
         if: steps.php-build-cache.outputs.cache-hit != 'true'