Docker publish

.dockerignore

@@ -0,0 +1 @@
+Dockerfile

.github/workflows/release.yaml

@@ -28,3 +28,41 @@ jobs:
         goversion: "https://golang.org/dl/go1.17.3.linux-amd64.tar.gz"
         extra_files: LICENSE README.md smtprelay.ini
         ldflags: -s -w -X "main.appVersion=${{ env.APP_VERSION }}" -X "main.buildTime=${{ env.BUILD_TIME }}"
+
+  docker_release:
+    name: Docker release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Current
+        uses: actions/checkout@v2
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}},value=${{ env.APP_VERSION }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ env.APP_VERSION }}
+            type=semver,pattern={{major}},value=${{ env.APP_VERSION }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha

.gitignore

@@ -0,0 +1 @@
+vendor

Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:1.14.10-alpine3.12@sha256:0e691cd2b47d20f0c5b4ce55385b9d02fb9c66b78dcbaa4ce5a56d41b1c16491
+
+WORKDIR /workspace/source
+
+COPY go.* ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+  go build -ldflags '-w -extldflags "-static"'
+
+FROM gcr.io/distroless/base:nonroot@sha256:2261b65122adb19da72084617c03a9084c24b33fcd90edd74739f0fd631f0f60
+
+COPY --from=0 /workspace/source/smtprelay /usr/local/bin/smtprelay
+
+ENTRYPOINT [ "smtprelay", "-logfile=/proc/self/fd/1" ]
+CMD [ "--help" ]
+EXPOSE 25