Feat add release CI

.dockerignore

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+.github
+build
+.golangci.yml

.github/workflows/release.yml

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+on:
+  release:
+    types: [created]
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  release-binaries:
+    name: Release Go Binary
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # build and publish in parallel: linux/386, linux/amd64, linux/arm64, windows/386, windows/amd64, darwin/amd64, darwin/arm64
+        goos: [linux, windows, darwin]
+        goarch: ["386", amd64, arm64]
+        exclude:
+          - goarch: "386"
+            goos: darwin
+          - goarch: arm64
+            goos: windows
+    steps:
+      - uses: actions/checkout@v4
+      - uses: wangyoucao577/go-release-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          goos: ${{ matrix.goos }}
+          goarch: ${{ matrix.goarch }}
+          goversion: "1.21.5"
+          project_path: "./cmd/keygen"
+          binary_name: "keygen"
+
+  release-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - 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: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: stroomnetwork/keygen:${{ github.ref }}

Dockerfile

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+FROM golang:1.21.5 as builder
+
+WORKDIR "/go/src/keygen"
+
+COPY . ./
+
+RUN make build
+
+FROM alpine:3.19
+
+COPY --from=builder /go/src/keygen/build/keygen /usr/local/bin/
+
+CMD ["help"]
+ENTRYPOINT ["keygen"]