WIP: postgres db support

Part of https://git.coopcloud.tech/coop-cloud/matrix-synapse/issues/2.

README.md

@@ -3,14 +3,15 @@
 [![Build Status](https://drone.autonomic.zone/api/badges/coop-cloud/matrix-synapse/status.svg?ref=refs/heads/main)](https://drone.autonomic.zone/coop-cloud/matrix-synapse)
 
 <!-- metadata -->
-* **Category**: Apps
-* **Status**: 0, work-in-progress
-* **Image**: [`matrixdotorg/synapse`](https://hub.docker.com/r/matrixdotorg/synapse), 4, upstream
-* **Healthcheck**: Yes
-* **Backups**: No
-* **Email**: No
-* **Tests**: No
-* **SSO**: No
+
+- **Category**: Apps
+- **Status**: 0, work-in-progress
+- **Image**: [`matrixdotorg/synapse`](https://hub.docker.com/r/matrixdotorg/synapse), 4, upstream
+- **Healthcheck**: Yes
+- **Backups**: No
+- **Email**: No
+- **Tests**: No
+- **SSO**: No
 <!-- endmetadata -->
 
 ## Basic usage
@@ -27,3 +28,16 @@
 
 [abra]: https://git.autonomic.zone/autonomic-cooperative/abra
 [cc-traefik]: https://git.autonomic.zone/coop-cloud/traefik
+
+## Tips & Tricks
+
+### Generating a new `homeserver.yaml`
+
+```
+docker run -it \
+  --entrypoint="" \
+  -e SYNAPSE_SERVER_NAME=foo.com \
+  -e SYNAPSE_REPORT_STATS=no \
+  matrixdotorg/synapse:v1.48.0 \
+  sh -c '/start.py generate; cat /data/homeserver.yaml' > homeserver.yaml.tmpl`
+```