Refactor Github Action per b/485167538 (#14468)

Co-authored-by: Ben Knutson <benknutson@google.com>

Author: google-admin

.github/workflows/tests-unit-php.yml

@@ -150,17 +150,21 @@ jobs:
 
       - name: Verify MariaDB connection
         run: |
-          while ! mysqladmin ping -h"127.0.0.1" -P"${{ job.services.mysql.ports[3306] }}" --silent; do
+          while ! mysqladmin ping -h"127.0.0.1" -P"${JOB_SERVICES_MYSQL_3307TH_PORTS}" --silent; do
             sleep 1
           done
+        env:
+          JOB_SERVICES_MYSQL_3307TH_PORTS: ${{ job.services.mysql.ports[3306] }}
 
       - name: Install svn
         run: |
           sudo apt update -y --allow-releaseinfo-change
           sudo apt install -y subversion
 
       - name: Set up tests
-        run: bash bin/install-wp-tests.sh wordpress_test root '' 127.0.0.1:${{ job.services.mysql.ports['3306'] }} ${{ matrix.wp }} true
+        run: bash bin/install-wp-tests.sh wordpress_test root '' 127.0.0.1:${JOB_SERVICES_MYSQL_PORTS_3306} ${{ matrix.wp }} true
+        env:
+          JOB_SERVICES_MYSQL_PORTS_3306: ${{ job.services.mysql.ports['3306'] }}
 
       - name: Set up problem matchers for PHPUnit
         run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"