fix(Postgres): Add container name or postgres by default on postgres host

gitea/docker-compose.yml

@@ -13,7 +13,7 @@ services:
       # - USER_UID=1000
       # - USER_GID=1000
       DB_TYPE: postgres
-      DB_HOST: postgres:5432
+      DB_HOST: ${POSTGRES_CONTAINER_NAME:-postgres}:5432 # Default name is same as ../postgres/docker-compose.yml:8
       DB_NAME: ${POSTGRES_DB}
       DB_USER: ${POSTGRES_USER}
       DB_PASSWD: ${POSTGRES_PASSWORD}