feat(web/panettone): Add dev helpers for postgres db

Add a docker-compose file and lorri-based direnv for aiding in
running and connecting to a postgres database during development of
panettone.

Change-Id: I319eee52b52cd48e1f3d2e32c558989768dc19d8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1465
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: eta <eta@theta.eu.org>

web/panettone/docker-compose.yml

@@ -0,0 +1,11 @@
+version: '3.4'
+services:
+  postgres:
+    image: postgres:11
+    restart: always
+    environment:
+      POSTGRES_USER: panettone
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: panettone
+    ports:
+      - 127.0.0.1:5432:5432