fix: use mysql service container for nightly tests

Author: KentarouTakeda

.github/workflows/nightly.yml

@@ -42,6 +42,13 @@ jobs:
     needs: GENERATE_MATRIX
     if: ${{ needs.GENERATE_MATRIX.outputs.branches != '[]' }}
     services:
+      mysql:
+        image: mysql:8.3
+        ports:
+          - 3306:3306
+        env:
+          MYSQL_DATABASE: test
+          MYSQL_ROOT_PASSWORD: root
       postgres:
         image: postgres
         env:
@@ -286,6 +293,13 @@ jobs:
   COVERAGE_DEBUG_NTS:
     if: github.repository_owner == 'php' || github.event_name == 'workflow_dispatch'
     services:
+      mysql:
+        image: mysql:8.3
+        ports:
+          - 3306:3306
+        env:
+          MYSQL_DATABASE: test
+          MYSQL_ROOT_PASSWORD: root
       postgres:
         image: postgres
         env:
@@ -501,6 +515,13 @@ jobs:
     needs: GENERATE_MATRIX
     if: ${{ needs.GENERATE_MATRIX.outputs.branches != '[]' }}
     services:
+      mysql:
+        image: mysql:8.3
+        ports:
+          - 3306:3306
+        env:
+          MYSQL_DATABASE: test
+          MYSQL_ROOT_PASSWORD: root
       postgres:
         image: postgres
         env: