Initial commit

.github/workflows/build.yml

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+name: "Build"
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate Docker metadata
+        id: docker-meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            docker.io/${{ github.repository }}
+            ghcr.io/${{ github.repository }}
+          flavor: latest=false
+          tags: |
+            type=ref,event=branch
+
+      - name: Generate GitHub metadata
+        id: github-meta
+        uses: dockerbakery/github-metadata-action@v2
+
+      - name: Build and push
+        uses: docker/bake-action@v4
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          files: |
+            ./docker-bake.hcl
+            ${{ steps.docker-meta.outputs.bake-file }}
+            ${{ steps.github-meta.outputs.bake-file }}
+          set: |
+            *.cache-from=type=gha
+            *.cache-to=type=gha,mode=max
+
+      - name: Docker Metadata Summary
+        uses: dockerbakery/docker-metadata-summary@v1

Caddyfile

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+:80 {
+	reverse_proxy {$TARGET_TASK_ADDR}
+}

Dockerfile

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+ARG CADDY_VERSION="latest"
+FROM caddy:${CADDY_VERSION}
+
+ENV TARGET_TASK_ADDR=localhost
+COPY Caddyfile /etc/caddy/Caddyfile

Makefile

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+make:
+	docker buildx bake local --load

README.md

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+# About
+
+A simple Docker Swarm's Task proxy service that forwards requests to the appropriate a single service that binds to a specific address and port.
+
+Why? It useful when you have a service that required high availability setup with pesky advertise address interface and port binding.

docker-bake.hcl

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+variable "CADDY_VERSION" { default = "latest" }
+
+target "docker-metadata-action" {}
+target "github-metadata-action" {}
+
+target "default" {
+    inherits = [ "docker-task-proxy" ]
+    platforms = [
+        "linux/amd64",
+        "linux/arm64"
+    ]
+}
+
+target "local" {
+    inherits = [ "docker-task-proxy" ]
+    tags = [ "swarmlibs/docker-task-proxy:local" ]
+}
+
+target "docker-task-proxy" {
+    context = "."
+    dockerfile = "Dockerfile"
+    inherits = [
+        "docker-metadata-action",
+        "github-metadata-action",
+    ]
+    args = {
+        CADDY_VERSION = "${CADDY_VERSION}"
+    }
+}