publish to docker automatically on tag (#35)

.github/workflows/docker.yaml

@@ -0,0 +1,81 @@
+name: Release to Docker
+
+# Controls when the action will run.
+on:
+  workflow_dispatch:
+  push:
+    # only publish on version tags
+    tags:
+      - 'v*.*.*'
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      with:
+        path: |
+          ~/go/pkg/mod
+          ~/go/bin
+          ~/bin/protoc
+          ~/.cache
+        key: ${{ runner.os }}-livekit-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-livekit-
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v3
+      with:
+        # list of Docker images to use as base name for tags
+        images: |
+          livekit/livekit-server
+        # generate Docker tags based on the following events/attributes
+        tags: |
+          type=semver,pattern=v{{version}}
+          type=semver,pattern=v{{major}}.{{minor}}
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.16
+
+    - name: Download Go modules
+      run: go mod download
+
+    - name: Download protoc
+      run: curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v3.15.8/protoc-3.15.8-linux-x86_64.zip
+
+    - name: Install protoc
+      run: |
+        sudo unzip protoc-3.15.8-linux-x86_64.zip -d /usr
+        sudo chmod 755 /usr/bin/protoc
+
+    - name: Install protobuf generators
+      run: |
+        go install github.com/twitchtv/twirp/protoc-gen-twirp
+        go install google.golang.org/protobuf/cmd/protoc-gen-go
+
+    - name: Generate code
+      uses: magefile/mage-action@v1
+      with:
+        version: latest
+        args: generate
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login to DockerHub
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+    - name: Build and push
+      id: docker_build
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        push: true
+        platforms: linux/amd64,linux/arm64
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}