Add Docker support

.github/workflows/docker.yaml

@@ -0,0 +1,38 @@
+name: docker
+
+on:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v*"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=latest
+            type=semver,pattern=v{{version}}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.21-alpine AS builder
+
+COPY . /app
+
+WORKDIR /app
+
+RUN go build -o indexer ./cmd
+
+
+FROM alpine
+
+COPY --from=builder /app/indexer /usr/local/bin/indexer
+
+ENTRYPOINT [ "/usr/local/bin/indexer" ]