added basic docker image

.github/workflows/docker.yml

@@ -0,0 +1,42 @@
+name: Create and publish a Docker image
+
+on:
+  push:
+    tags:
+      - v*
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.CR_PAT }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM golang as build-env
+
+WORKDIR /go/src/app
+COPY . /go/src/app
+
+RUN go get -d -v ./...
+
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /go/bin/app /go/src/app/
+
+FROM gcr.io/distroless/base
+
+COPY --from=build-env /go/bin/app /app
+
+CMD ["/app"]

docker-compose.example.yml

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+version: '3'
+
+services:
+  app:
+    build: .
+    container_name: app
+    restart: unless-stopped
+    ports:
+      - 3000:3000
+    volumes:
+      - ./config.example.yaml:/config.yaml
+
+
+  nginx:
+    image: nginx
+    container_name: nginx
+    restart: unless-stopped
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - ./certs:/etc/letsencrypt
+      - ./nginx.conf:/etc/nginx/nginx.conf
+    depends_on:
+      - app
+
+  certbot:
+    image: certbot/certbot
+    container_name: certbot
+    restart: unless-stopped
+    volumes:
+      - ./certs:/etc/letsencrypt
+      - ./certbot/conf:/etc/letsencrypt
+    command: certonly --webroot --webroot-path=/var/www/certbot --email=<your-email> --agree-tos --no-eff-email --staging -d <your-domain-name>