feat: add Dockerfile and workflow (#1)

* chore: add Dockerfile

* chore: update Dockerfile

* feat: add docker image CD workflow

.github/workflows/docker-image.yml

@@ -0,0 +1,43 @@
+name: Docker Image CD
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get git tag
+        id: tag
+        uses: dawidd6/action-get-tag@v1
+        with:
+          strip_v: true
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to DockerHub
+        uses: docker/[email protected]
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Login to GitHub Container Registry
+        uses: docker/[email protected]
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+      - name: Build and push the docker image
+        uses: docker/build-push-action@v3
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            timothyye/knockd:latest
+            timothyye/knockd:${{steps.tag.outputs.tag}}
+            ghcr.io/timothyye/knockd:latest
+            ghcr.io/timothyye/knockd:${{steps.tag.outputs.tag}}
+          build-args: |
+            VERSION=v${{ steps.tag.outputs.tag }}

Dockerfile

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+# Use the Rust official image for the build stage
+FROM rust:latest as builder
+
+# Add target for musl
+RUN rustup target add x86_64-unknown-linux-musl
+
+COPY ./knockd /knockd
+
+WORKDIR /knockd
+
+# Build your application on the musl target.
+# This creates a statically linked executable.
+RUN cargo build --release --target=x86_64-unknown-linux-musl
+
+FROM alpine
+
+# Install iptables
+RUN apk add --no-cache iptables
+
+# Create a symbolic link from /sbin/iptables to /usr/sbin/iptables
+RUN ln -s /sbin/iptables /usr/sbin/iptables
+
+# Copy the binary from the builder stage
+COPY --from=builder /knockd/target/x86_64-unknown-linux-musl/release/knockd /
+
+# Command to run
+CMD ["/knockd"]