add dockerfile and CI/CD (#10)

* add dockerfile and CI/CD

* Use ubuntu not alpine

couldn't build in alpine :'(

.github/workflows/docker-image.yml

@@ -0,0 +1,82 @@
+name: Docker CI/CD
+
+on:
+  push:
+    branches:
+    - main
+    pull_request:
+      branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    outputs:
+      sha: ${{ steps.push.outputs.digest }}
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Log in to the Container registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ghcr.io/posthog/livestream
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v2
+
+    - name: Build and push Docker image
+      id: push
+      if: github.ref == 'refs/heads/main'
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        platforms: linux/amd64,linux/arm64
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+
+  # deploy:
+  #   runs-on: ubuntu-latest
+  #   needs: build
+  #   steps:
+  #   - name: get deployer token
+  #     id: deployer
+  #     uses: getsentry/action-github-app-token@v3
+  #     with:
+  #         app_id: ${{ secrets.DEPLOYER_APP_ID }}
+  #         private_key: ${{ secrets.DEPLOYER_APP_PRIVATE_KEY }}
+
+  #   - name: Trigger livestream deployment
+  #     uses: peter-evans/repository-dispatch@v3
+  #     with:
+  #         token: ${{ steps.deployer.outputs.token }}
+  #         repository: PostHog/charts
+  #         event-type: commit_state_update
+  #         client-payload: |
+  #             {
+  #               "values": {
+  #                 "image": {
+  #                   "sha": "${{ needs.build.outputs.sha }}"
+  #                 }
+  #               },
+  #               "release": "livestream",
+  #               "commit": ${{ toJson(github.event.head_commit) }},
+  #               "repository": ${{ toJson(github.repository) }}
+  #             }

Dockerfile

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+FROM golang:1.22 as builder
+WORKDIR /code
+COPY go.sum go.mod .
+RUN go mod download -x
+
+COPY . ./
+RUN go get ./...
+RUN go build -v -o /livestream ./...
+
+FROM ubuntu
+COPY --from=builder /livestream /livestream
+CMD ["/livestream"]