Revert changes to GHA test setup

Author: schlessera

.github/workflows/testing.yml

@@ -59,60 +59,45 @@ jobs:
 
   functional: #----------------------------------------------------------------------
     name: Functional - WP ${{ matrix.wp }} on PHP ${{ matrix.php }} with MySQL ${{ matrix.mysql }}
-    continue-on-error: ${{ matrix.experimental }}
     strategy:
       fail-fast: false
       matrix:
-        php: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
+        php: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
         wp: ['latest']
         mysql: ['8.0']
         test: ["composer behat || composer behat-rerun"]
-        experimental: [false]
         include:
           - php: '5.6'
             wp: 'trunk'
             mysql: '8.0'
-            experimental: false
             test: "composer behat || composer behat-rerun"
           - php: '5.6'
             wp: 'trunk'
             mysql: '5.7'
-            experimental: false
             test: "composer behat || composer behat-rerun"
           - php: '5.6'
             wp: 'trunk'
             mysql: '5.6'
-            experimental: false
             test: "composer behat || composer behat-rerun"
           - php: '7.4'
             wp: 'trunk'
             mysql: '8.0'
-            experimental: true
             test: "composer behat || composer behat-rerun"
           - php: '8.0'
             wp: 'trunk'
             mysql: '8.0'
-            experimental: true
-            test: "composer behat || composer behat-rerun"
-          - php: '8.0'
-            wp: 'latest'
-            mysql: '8.0'
-            experimental: true
             test: "composer behat || composer behat-rerun"
           - php: '8.0'
             wp: 'trunk'
             mysql: '5.7'
-            experimental: true
             test: "composer behat || composer behat-rerun"
           - php: '8.0'
             wp: 'trunk'
             mysql: '5.6'
-            experimental: true
             test: "composer behat || composer behat-rerun"
           - php: '5.6'
             wp: '3.7'
             mysql: '5.6'
-            experimental: false
             test: "composer behat || composer behat-rerun"
     runs-on: ubuntu-20.04
 
@@ -124,10 +109,6 @@ jobs:
         options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3 -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=wp_cli_test --entrypoint sh mysql:${{ matrix.mysql }} -c "exec docker-entrypoint.sh mysqld --default-authentication-plugin=mysql_native_password"
 
     steps:
-
-      - name: Test connect to MySQL
-        run: mysql -uroot -proot -h127.0.0.1 -P${{ job.services.mysql.ports[3306] }} -e "SHOW DATABASES"
-
       - name: Check out source code
         uses: actions/checkout@v2
 
@@ -144,7 +125,7 @@ jobs:
           php-version: '${{ matrix.php }}'
           extensions: mysql, zip
           coverage: none
-          tools: composer, phpunit:5.7.27
+          tools: composer
 
       - name: Get Composer cache Directory
         if: steps.check_files.outputs.files_exists == 'true'
@@ -165,6 +146,10 @@ jobs:
         if: steps.check_files.outputs.files_exists == 'true'
         run: COMPOSER_ROOT_VERSION=dev-master composer install --prefer-dist --no-progress --no-suggest
 
+      - name: Start MySQL server
+        if: steps.check_files.outputs.files_exists == 'true'
+        run: sudo systemctl start mysql
+
       - name: Configure DB environment
         if: steps.check_files.outputs.files_exists == 'true'
         run: |