Add EdgeDB Support, a Graph DB upon Postgres

[Vonng]

trafficstars

We can use docker for that and use existing pigsty postgres with --backend-dsn option.

edgedb-server \
  --backend-dsn postgres://dbuser_edge:[email protected]:5433 \
  --enable-backend-adaptive-ha

Reference: https://www.edgedb.com/docs/reference/backend_ha