Unable to install Postgres 12 or 13 on a new app

[joesiewert]

I am getting the following when trying to install Postgres 12 or 13 on a new app:

-----> Copying .profile.d/00-pg-path.sh to add postgresql binaries to PATH
-----> Postgresql done
-----> Timed out running buildpack Postgresql
 !     Push failed

It will hang on Postgresql done until the Heroku build timeout kicks in. I am using the POSTGRESQL_VERSION config var to specify the version. If I switch it to Postgres 10 or 11 on the same app it works as expected.