Initial commit: Shlink docker compose stack

Self-hosted Shlink URL shortener with the official web dashboard,
backed by PostgreSQL 16. Designed to sit behind a reverse proxy
that terminates TLS.

- shlink server exposed on host port 8500
- shlink-web-client dashboard exposed on host port 8501
- postgres 16 kept internal, persisted via named volume
- dashboard preconfigured via SHLINK_PUBLIC_URL + INITIAL_API_KEY
- .env.example documents required variables; .env is gitignored

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,56 @@
+services:
+  shlink:
+    image: shlinkio/shlink:stable
+    container_name: shlink
+    restart: unless-stopped
+    depends_on:
+      shlink-db:
+        condition: service_healthy
+    ports:
+      - "${SHLINK_SERVER_PORT:-8500}:8080"
+    environment:
+      DEFAULT_DOMAIN: ${DEFAULT_DOMAIN}
+      IS_HTTPS_ENABLED: ${IS_HTTPS_ENABLED:-true}
+      GEOLITE_LICENSE_KEY: ${GEOLITE_LICENSE_KEY:-}
+      INITIAL_API_KEY: ${INITIAL_API_KEY}
+      DB_DRIVER: postgres
+      DB_HOST: shlink-db
+      DB_PORT: 5432
+      DB_NAME: ${POSTGRES_DB:-shlink}
+      DB_USER: ${POSTGRES_USER:-shlink}
+      DB_PASSWORD: ${POSTGRES_PASSWORD}
+      TIMEZONE: ${TIMEZONE:-UTC}
+    volumes:
+      - shlink-data:/etc/shlink/data
+
+  shlink-db:
+    image: postgres:16-alpine
+    container_name: shlink-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-shlink}
+      POSTGRES_USER: ${POSTGRES_USER:-shlink}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    volumes:
+      - shlink-db-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-shlink} -d ${POSTGRES_DB:-shlink}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  shlink-dashboard:
+    image: shlinkio/shlink-web-client:stable
+    container_name: shlink-dashboard
+    restart: unless-stopped
+    depends_on:
+      - shlink
+    ports:
+      - "${SHLINK_DASHBOARD_PORT:-8501}:8080"
+    environment:
+      SHLINK_SERVER_URL: ${SHLINK_PUBLIC_URL}
+      SHLINK_SERVER_API_KEY: ${INITIAL_API_KEY}
+
+volumes:
+  shlink-data:
+  shlink-db-data: