Revert to GHCR_PAT (#776)

Author: lloesche

.github/workflows/docker-build.yml

@@ -5,7 +5,7 @@ on:
     branches:
       - main
     tags:
-      - 'v*'
+      - "v*"
   pull_request:
     branches:
       - main
@@ -109,14 +109,7 @@ jobs:
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-#      - name: Login to Docker Hub
-#        if: github.event_name != 'pull_request'
-#        uses: docker/login-action@v3
-#        with:
-#          username: ${{ vars.DOCKERHUB_USERNAME }}
-#          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          password: ${{ secrets.GHCR_PAT }}
 
       - name: Docker meta
         id: meta