Docs: Add section on entering containers

docs/administration/install-docker-compose.md

@@ -202,6 +202,20 @@ docker system prune
 
 This will <u>not</u> delete the Docker volumes (where the databases and therefore the persistent data lives).
 
+### Log into a container
+
+To *bash* into an already running container execute
+
+```bash
+docker-compose exec -it steering bash
+```
+
+To log into the database of a PostgreSQL container you can run
+
+```bash
+docker compose exec steering-postgres psql -U steering
+```
+
 ## Deploy other Docker Images
 
 If you prefer some individual deployment scenario, you can also [install single components using Docker only](install-docker.md). These Docker images are hosted on [https://hub.docker.com/u/autoradio](https://hub.docker.com/u/autoradio).