Merge pull request #1685 from nextcloud/fix/phpunit

phpunit: use custom db images to fix rate limiting

.github/workflows/phpunit.yml

@@ -108,7 +108,7 @@ jobs:
 
     services:
       mysql:
-        image: mariadb:10.6
+        image: ghcr.io/nextcloud/continuous-integration-mariadb-10.11:latest
         ports:
           - 4444:3306/tcp
         env:
@@ -175,7 +175,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:14
+        image: ghcr.io/nextcloud/continuous-integration-postgres-15:latest
         ports:
           - 4444:5432/tcp
         env: