Simplify CI to use plain docker build

.forgejo/workflows/deploy.yml

@@ -6,6 +6,11 @@ on:
       - main
       - development
 
+env:
+  DOCKER_HOST: tcp://docker-in-docker:2375
+  REGISTRY: forgejo.wulfconsulting.cloud
+  IMAGE: forgejo.wulfconsulting.cloud/lorentz/quest-vorteq
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -13,16 +18,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to Forgejo Registry
-        uses: docker/login-action@v3
-        with:
-          registry: forgejo.wulfconsulting.cloud
-          username: ${{ secrets.REGISTRY_USERNAME }}
-          password: ${{ secrets.REGISTRY_PASSWORD }}
-
       - name: Determine tag
         id: tag
         run: |
@@ -32,12 +27,14 @@ jobs:
             echo "tag=dev" >> $GITHUB_OUTPUT
           fi
 
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          push: true
-          tags: forgejo.wulfconsulting.cloud/lorentz/quest-vorteq:${{ steps.tag.outputs.tag }}
+      - name: Login to Forgejo Registry
+        run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login $REGISTRY -u ${{ secrets.REGISTRY_USERNAME }} --password-stdin
+
+      - name: Build image
+        run: docker build -t $IMAGE:${{ steps.tag.outputs.tag }} .
+
+      - name: Push image
+        run: docker push $IMAGE:${{ steps.tag.outputs.tag }}
 
   deploy:
     needs: build