The configure script uses the `command` builtin command which is bash
specific while having a "#!/bin/sh" head.
This forces the use nix default shell (bash)
(cherry picked from commit 159a021bd83bc3e1bd385fe89522aea877eea29c)
postage is no longer maintained and has been replaced by the identical pgmanage. See:
https://github.com/workflowproducts/postage#postage-has-been-replaced-with-pgmanage
The following error is raised when a user enables the deprecated `services.postage.enable` option:
Failed assertions:
- services.postage is deprecated in favor of pgmanage. They have the same options so just substitute postage for pgmanage.
