This change allows the newly made database user to apply migrations.
It also includes a very Azure-specific change. Say we have an Azure
Postgres database user "root", which is the user making the database
connections for this script, and it is creating an "atat" user/role.
That root user will be a member of the azure_pg_admin group. In order
for root to change the ownership of the tables in the database to
atat, it needs to have membership in the atat role. To achieve this we
grant azure_pg_admin the atat role.
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