ci: add GitHub Actions workflow to publish Docker image to GHCR and add prod compose

.github/workflows/docker-publish.yml

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+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+      - feat/simpsync-hardened-backend
+    tags:
+      - 'v*.*.*'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    name: Build and Push Docker Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=raw,value=latest
+            type=ref,event=branch
+            type=sha,format=short
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

docker-compose.prod.yml

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+services:
+  server:
+    image: ghcr.io/muriloscolari/simpsync:latest
+    container_name: simpsync-server
+    restart: unless-stopped
+    read_only: true
+    security_opt:
+      - no-new-privileges:true
+    cap_drop:
+      - ALL
+    ports:
+      - "127.0.0.1:8787:8787"
+    environment:
+      - PORT=8787
+      - POSTGRES_HOST=simpsync-db
+      - POSTGRES_PORT=5432
+      - POSTGRES_USER=simpsync
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=simpsync
+      - AUTH_PEPPER=${AUTH_PEPPER}
+      - ALLOW_REGISTRATION=${ALLOW_REGISTRATION:-true}
+      - MAX_USERS=${MAX_USERS:-1}
+      - RATE_LIMIT_RPS=5
+      - RATE_LIMIT_BURST=10
+      - CLEANUP_INTERVAL_HOURS=24
+    depends_on:
+      simpsync-db:
+        condition: service_healthy
+    networks:
+      - simpsync-net
+    labels:
+      - "com.centurylinklabs.watchtower.enable=true"
+
+  simpsync-db:
+    image: postgres:15-alpine
+    container_name: simpsync-db
+    restart: unless-stopped
+    environment:
+      - POSTGRES_USER=simpsync
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=simpsync
+    volumes:
+      - simpsync_pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U simpsync"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - simpsync-net
+
+networks:
+  simpsync-net:
+    driver: bridge
+
+volumes:
+  simpsync_pgdata: