Add build job

.github/workflows/build.yaml

@@ -0,0 +1,69 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  release:
+    types:
+      - published
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Go 1.20
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20.4'
+
+      - name: Install dependencies
+        run: |
+          go install go.opentelemetry.io/collector/cmd/builder@latest
+          go install github.com/open-telemetry/opentelemetry-collector-contrib/cmd/mdatagen@latest
+
+      - name: Get release tag
+        if: github.event_name == 'release'
+        run: echo "RELEASE_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Prepare release
+        run: builder --skip-compilation --config examples/loki/builder-config.yaml 
+
+      - name: Build Go binary amd64
+        run: cd examples/loki/collector-loki/ && go build -ldflags "-s -w -X main.GitCommit=$GITHUB_SHA -X main.GitRef=$GITHUB_REF -X main.Version=${RELEASE_TAG:-commit-$GITHUB_SHA}" -o castai-collector-loki
+        env:
+          GOOS: linux
+          GOARCH: amd64
+          CGO_ENABLED: 0
+
+      - 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
+        uses: docker/login-action@v2
+        if: ${{ github.event_name == 'pull_request' }}
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push pr
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: docker/build-push-action@v2
+        with:
+          context: ./examples/loki/
+          file: ./examples/loki/Dockerfile
+          platforms: linux/arm64,linux/amd64
+          push: ${{ github.event_name == 'pull_request' }}
+          tags: ghcr.io/castai/otelcol-receiver:${{ github.sha }}