Add Docker Compose setup for self-hosted Shlink on Coolify

.env.example

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+# Your short URL domain (e.g. s.example.com)
+DEFAULT_DOMAIN=s.example.com
+
+# Set to false if running without TLS termination
+IS_HTTPS_ENABLED=true
+
+# Database
+DB_NAME=shlink
+DB_USER=shlink
+DB_PASSWORD=change_me_strong_password
+
+# Generate a UUID or random string for the initial API key
+# e.g.: openssl rand -hex 32
+INITIAL_API_KEY=change_me_api_key
+
+# Timezone (https://www.php.net/manual/en/timezones.php)
+TIMEZONE=UTC

.gitignore

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+.env

README.md

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+# Shlink — self-hosted URL shortener
+
+Deployed on [Coolify](https://coolify.io) via Docker Compose.
+
+## Coolify setup
+
+1. Create a new resource → **Docker Compose** → point to this repo.
+2. In the Coolify environment variables UI, set the values from `.env.example`:
+   - `DEFAULT_DOMAIN` — your short URL domain (e.g. `s.example.com`)
+   - `DB_PASSWORD` — strong random password
+   - `INITIAL_API_KEY` — initial API key (`openssl rand -hex 32`)
+   - `TIMEZONE` — your timezone
+3. Add a domain in Coolify pointing to port `8080`.
+4. Deploy.
+
+## Shlink Web UI
+
+Optionally connect [shlink-web-client](https://app.shlink.io) to your instance using your domain and API key.

docker-compose.yml

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+services:
+  shlink:
+    image: shlinkio/shlink:stable
+    restart: unless-stopped
+    environment:
+      DEFAULT_DOMAIN: ${DEFAULT_DOMAIN}
+      IS_HTTPS_ENABLED: ${IS_HTTPS_ENABLED:-true}
+      DB_DRIVER: postgres
+      DB_HOST: db
+      DB_PORT: 5432
+      DB_NAME: ${DB_NAME:-shlink}
+      DB_USER: ${DB_USER:-shlink}
+      DB_PASSWORD: ${DB_PASSWORD}
+      INITIAL_API_KEY: ${INITIAL_API_KEY}
+      TIMEZONE: ${TIMEZONE:-UTC}
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - "8080:8080"
+
+  db:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${DB_NAME:-shlink}
+      POSTGRES_USER: ${DB_USER:-shlink}
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-shlink} -d ${DB_NAME:-shlink}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+volumes:
+  db_data: