RPM folder has read-only permissions for user pulp

[romeroalx]

Version
3.69.2

Describe the bug
The folder /var/lib/rpm has read-only permissions for group and others, and the owner is root which makes the user pulp unable to
make modifications.

For example, if I try to import a GPG public key in RPM (needed for using signing-scripts), I get the error:

error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)\nerror: /tmp/RPM-GPG-KEY: key 1 import failed."

To Reproduce

1. Export GPG public key:

bash-5.1$ gpg --export -a $PULP_SIGNING_KEY_FINGERPRINT > /tmp/RPM-GPG-KEY`

2. Try to import the key into RPM:

bash-5.1$ rpm --import /tmp/RPM-GPG-KEY
error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)

3. Check permissions of /var/lib/rpm

bash-5.1$ ls -al /var/lib/rpm
total 26356
drwxr-xr-x 1 root root       91 Nov  6 16:25 .
drwxr-xr-x 1 root root       18 Feb  4 01:46 ..
-rw-r--r-- 1 root root 26955776 Feb  4 01:46 rpmdb.sqlite
-rw-r--r-- 1 root root    32768 Feb  4 01:46 rpmdb.sqlite-shm
-rw-r--r-- 1 root root        0 Feb  4 01:46 rpmdb.sqlite-wal
-rw-r--r-- 1 root root        0 Jan 24 04:12 .rpm.lock

bash-5.1$ id
uid=700(pulp) gid=700(pulp) groups=700(pulp)

Expected behavior
When the permissions are correctly set, public keys can be imported into RPM

Additional context
Necessary for using signing-services: pulp/pulp-operator#1401