Fix gallery creation validation and validators returning incorrect er… (#263)

* Fix gallery creation validation and validators returning incorrect errors

* Remove docker image

* Add URL validation for pack files

* Remove unneeded dependencies

.github/workflows/docker-compile.yml

@@ -20,9 +20,7 @@ jobs:
         id: docker_meta
         uses: crazy-max/ghaction-docker-meta@v1
         with:
-          images: |
-            ghcr.io/modrinth/labrinth
-            docker.io/modrinth/labrinth
+          images: ghcr.io/modrinth/labrinth
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v1
@@ -45,13 +43,6 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      -
-        name: Login to DockerHub
-        uses: docker/login-action@v1
-        if: github.event_name != 'pull_request'
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
       -
         name: Build and push
         uses: docker/build-push-action@v2