feat: Docker image, compose stack, and GHCR publish workflow

.dockerignore

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+.git
+.github
+graphify-out
+*.md
+LICENSE
+install.sh
+completions

.github/workflows/docker-publish.yml

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+name: Docker
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build image
+        run: docker build -t pgsync:ci .
+
+      - name: Version smoke test
+        run: docker run --rm pgsync:ci --version
+
+      - name: Compose sync smoke test
+        run: PGSYNC_IMAGE=pgsync:ci docker compose run --rm pgsync
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: smoke
+    if: github.event_name != 'pull_request'
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha,prefix=
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitignore

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+graphify-out/

Dockerfile

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+FROM postgres:16-bookworm
+
+LABEL org.opencontainers.image.source="https://github.com/mamahoos/pgsync"
+LABEL org.opencontainers.image.description="PostgreSQL logical sync (pg_dump | psql)"
+
+COPY pgsync.sh /usr/local/bin/pgsync
+RUN chmod 755 /usr/local/bin/pgsync
+
+ENTRYPOINT ["pgsync"]
+CMD ["--help"]

docker-compose.yml

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+# Local demo / CI smoke test: two Postgres instances + one-shot sync.
+#
+# Smoke test:
+#   docker compose run --rm pgsync
+#
+# Custom URIs (external clusters):
+#   docker compose run --rm pgsync \
+#     -s 'postgresql://user:pass@host:5432/src' \
+#     -t 'postgresql://user:pass@host:5432/dst'
+#
+# Pull from GHCR instead of building locally:
+#   PGSYNC_IMAGE=ghcr.io/mamahoos/pgsync:latest docker compose run --rm pgsync
+
+services:
+  source:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: app
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d app"]
+      interval: 2s
+      timeout: 5s
+      retries: 15
+      start_period: 5s
+
+  target:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: app
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d app"]
+      interval: 2s
+      timeout: 5s
+      retries: 15
+      start_period: 5s
+
+  pgsync:
+    image: ${PGSYNC_IMAGE:-ghcr.io/mamahoos/pgsync:latest}
+    build: .
+    depends_on:
+      source:
+        condition: service_healthy
+      target:
+        condition: service_healthy
+    command:
+      - -s
+      - postgresql://postgres:postgres@source:5432/app
+      - -t
+      - postgresql://postgres:postgres@target:5432/app
+      - -v