adding Umask key to Quadlet. (2nd attempt)

[geraveoyomama]

Committer: Gerben Damave [email protected]

Does this PR introduce a user-facing change?

Adds the Umask= key for .container is added to the quadlet generator.

attempt no. 2

Closes #25278

[openshift-ci]

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[Luap99]

Thanks, code wise LGTM but please fix your commit message,
remove Committer: Gerben Damave <[email protected]> and then make sure you have an empty line before adding Fixes #25278.
You can edit the commit message with git commit --amend and then just force push the commit again.