fixed docker tag issue

.drone.yml

@@ -9,7 +9,8 @@ steps:
     dry_run: true
     repo: nickslowinski/robotter112.de-php-docker
     tags:
-      - 'dev/v7.4'
+      - '7.4-dev'
+      - '7-dev'
     username:
       from_secret: ns_docker_username
     password: