Adds an example of docker compose for external database

Author: butschster

docs/config/external-db.md

@@ -76,4 +76,41 @@ migrations, or if they were not executed for some reason, you can run them manua
    ```
 
    This command forcefully runs the migrations regardless of the current state, ensuring that all necessary tables are
-   properly set up in the database.
+   properly set up in the database.
+
+## Docker compose example
+
+Here’s an example of a `docker-compose.yml` file that sets up a PostgreSQL database for Buggregator:
+
+```yaml
+version: '3.9'
+
+services:
+  buggregator:
+    image: ghcr.io/buggregator/server:latest
+    depends_on:
+      buggregator-database:
+        condition: service_healthy
+    ports:
+      - 127.0.0.1:8000:8000
+    environment:
+      PERSISTENCE_DRIVER: db
+      DB_DRIVER: pgsql
+      DB_DATABASE: buggregator
+      DB_HOST: buggregator-database
+      DB_PORT: 5432
+      DB_USERNAME: root
+      DB_PASSWORD: secret
+
+  buggregator-database:
+    image: postgres:latest
+    healthcheck:
+      test: [ "CMD-SHELL", "pg_isready --username=buggregator --dbname=buggregator" ]
+      interval: 3s
+      timeout: 3s
+      retries: 1
+    environment:
+      POSTGRES_DB: buggregator
+      POSTGRES_USER: root
+      POSTGRES_PASSWORD: secret
+```