docker ci

.github/workflows/ci.yaml

@@ -15,3 +15,21 @@ jobs:
           instance: https://cache.icewind.me
           authToken: '${{ secrets.ATTIC_TOKEN }}'
       - run: nix build .#frontend
+
+  docker:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v20
+      - uses: icewind1991/attic-action@v1
+        with:
+          name: ci
+          instance: https://cache.icewind.me
+          authToken: '${{ secrets.ATTIC_TOKEN }}'
+      - run: nix build .#docker
+      - name: Push image
+        if: github.ref == 'refs/heads/main'
+        run: |
+          skopeo copy --dest-creds="${{ secrets.DOCKERHUB_USERNAME }}:${{ secrets.DOCKERHUB_TOKEN }}" "docker-archive:$(nix build .#docker --print-out-paths)" "docker://demostf/frontend"