Remove github container registry

Signed-off-by: trivernis <trivernis@protonmail.com>

.github/workflows/docker.yml

@@ -19,13 +19,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.CR_PAT }}
-
       - name: Login to Portus
         uses: docker/login-action@v1
         with:
@@ -42,4 +35,3 @@ jobs:
           push: true
           tags: |
             flotte-docker-registry.spdns.org/frontend-server:latest
-            ghcr.io/flotte-meets-hwr-db/frontend/frontend-server