Init

.github/workflows/build-docker.yml

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+name: Build Docker
+
+on:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GHCR
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          context: .
+          file: ./Dockerfile
+

Dockerfile

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+ARG CADDY_VERSION=2.7
+FROM caddy:${CADDY_VERSION}-builder AS builder
+
+RUN xcaddy build \
+    --with github.com/lucaslorentz/caddy-docker-proxy/v2 \
+    --with github.com/pberkel/caddy-storage-redis
+
+FROM caddy:${CADDY_VERSION}-alpine
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy
+
+CMD ["caddy", "docker-proxy"]