run migrations via entrypoint script

Dockerfile

@@ -90,4 +90,4 @@ USER nobody
 # above and adding an entrypoint. See https://github.com/krallin/tini for details
 # ENTRYPOINT ["/tini", "--"]
 
-CMD ["/app/bin/server"]
+ENTRYPOINT ["/app/bin/docker-entrypoint.sh"]

README.md

@@ -255,7 +255,7 @@ For testing the production Docker build locally:
    docker compose -f docker-compose.prod.yml up
    ```
 
-5. **Run database migrations:**
+5. **Database migrations run automatically** on app start. For manual migration:
    ```bash
    docker compose -f docker-compose.prod.yml exec app /app/bin/mv eval "Mv.Release.migrate"
    ```

rel/overlays/bin/docker-entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+
+echo "==> Running database migrations..."
+/app/bin/migrate
+
+echo "==> Starting application..."
+exec /app/bin/server
+