chore: update Dockerfile and docker-compose for local dev

docker-compose.yml

@@ -1,18 +1,36 @@
-version: '3.8'
-
 services:
+  db:
+    image: mysql:8.0
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: wordpress_tests
+    tmpfs:
+      - /var/lib/mysql
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      interval: 5s
+      retries: 10
+
   app:
     build:
       context: .
       dockerfile: Dockerfile
+    depends_on:
+      db:
+        condition: service_healthy
     volumes:
       - .:/app
       - composer-cache:/root/.composer/cache
     environment:
-      - WP_TESTS_DIR=/tmp/wordpress-tests-lib
-    command: >
+      - WP_TESTS_DIR=/app/vendor/wp-phpunit/wp-phpunit
+      - WP_PHPUNIT__TESTS_CONFIG=/app/tests/wp-tests-config.php
+    entrypoint: >
       sh -c "
         composer install --no-interaction &&
+        if [ ! -f /app/tests/wp-tests-config.php ]; then
+          curl -sL https://github.com/WordPress/wordpress-develop/raw/master/wp-tests-config-sample.php > /tmp/wp-tests-config-sample.php &&
+          sed 's/youremptytestdbnamehere/wordpress_tests/' /tmp/wp-tests-config-sample.php | sed 's/yourusernamehere/root/' | sed 's/yourpasswordhere/root/' | sed 's/localhost/db/' > /app/tests/wp-tests-config.php
+        fi &&
         composer test
       "