ci: push docker image to git.ratte.dev container registry

.forgejo/workflows/build-docker.yaml

@@ -14,11 +14,18 @@ jobs:
       - uses: https://code.forgejo.org/actions/checkout@v4
       - name: Set up Docker Buildx
         uses: https://code.forgejo.org/docker/setup-buildx-action@v3
+      - name: Login to Container Registry
+        uses: https://code.forgejo.org/docker/login-action@v3
+        with:
+          registry: git.ratte.dev
+          username: Laborratte5
+          password: ${{ secrets.PACKAGE_REGISTRY_TOKEN }}
       - id: create_version_string
         run: echo version_tag=$(git rev-parse --short HEAD)-$(date --utc --iso-8601) >> $FORGEJO_OUTPUT
       - name: Build and push
         uses: https://code.forgejo.org/docker/build-push-action@v6
         with:
+          push: true
           tags: |
             git.ratte.dev/laborratte5/linux-iso-seeder:latest
             git.ratte.dev/laborratte5/linux-iso-seeder:${{ steps.create_version_string.outputs.version_tag }}