Add GitHub workflow to build container image

Signed-off-by: Ionut Balutoiu <[email protected]>

.github/workflows/container-image.yaml

@@ -0,0 +1,48 @@
+name: localshowd
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  container-image:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/localshowd
+          flavor: |
+            latest=${{ github.ref == 'refs/heads/main' }}
+          tags: |
+            type=sha
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          platforms: linux/amd64, linux/arm64, linux/arm/v7
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          context: .
+          pull: true
+          push: ${{ github.event_name != 'pull_request' }}

Dockerfile

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+FROM golang:latest as gobuilder
+ADD . /localshow
+WORKDIR /localshow
+ENV CGO_ENABLED=0
+RUN go build -ldflags="-s -w" -o ./localshowd ./cmd/localshowd
+
+FROM scratch
+COPY --from=gobuilder /localshow/localshowd /localshowd
+CMD ["/localshowd", "--config", "/config/config.toml"]