Use bash as login shell for postgres user

System users should use the nologin shell to deny logging as those are
not interactive users but a lot of existing documentation incorreclty
uses 'su' or 'sudo su' to create a shell under the postgres user for
PostgreSQL management.

Revert back to using '/bin/bash' as the login shell.

See: https://src.fedoraproject.org/rpms/postgresql/pull-request/60
Fixes: 3646f8d Use sysusers configuration to setup user & group

postgresql.spec

@@ -65,7 +65,7 @@ Summary: PostgreSQL client programs
 Name: postgresql
 %global majorversion 15
 Version: %{majorversion}.3
-Release: 6%{?dist}
+Release: 7%{?dist}
 
 # The PostgreSQL license is very similar to other MIT licenses, but the OSI
 # recognizes it as an independent license, so we do as well.
@@ -1262,6 +1262,9 @@ make -C postgresql-setup-%{setup_version} check
 
 
 %changelog
+* Thu Jul 13 2023 Timothée Ravier <tim@siosm.fr> - 15.3-7
+- Use bash as login shell for postgres user
+
 * Thu Jul 13 2023 František Zatloukal <fzatlouk@redhat.com> - 15.3-6
 - Rebuilt for ICU 73.2
 

postgresql.sysusers

@@ -1 +1 @@
-u postgres 26 "PostgreSQL Server" /var/lib/pgsql
+u postgres 26 "PostgreSQL Server" /var/lib/pgsql /bin/bash