add resoure-group option for the commands

[jialigit]

We should add the resource-group option like the others.

az postgres flexible-server db create \
  --resource-group ${RESOURCE_GROUP} \
  --database-name ${ORDER_SERVICE_DB} \
  --server-name ${POSTGRES_SERVER}

az postgres flexible-server db create \
  --resource-group ${RESOURCE_GROUP} \
  --database-name ${CATALOG_SERVICE_DB} \
  --server-name ${POSTGRES_SERVER}

[selvasingh]

Like commands to look shorter, hence, we are relying on configuring environment defaults