Fix #1627, The POSTGRES_ENTRYPOINT_INITDB variable is not set. Defaulting to a blank string. (#1639)

env-example

@@ -211,6 +211,7 @@ POSTGRES_DB=default
 POSTGRES_USER=default
 POSTGRES_PASSWORD=secret
 POSTGRES_PORT=5432
+POSTGRES_ENTRYPOINT_INITDB=./postgres/docker-entrypoint-initdb.d
 
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