adding Umask key to Quadlet. (2nd attempt)

[geraveoyomama]

Committer: Gerben Damave gerben@hephaestus.s8n.nl

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

[Luap99]

Thanks, code wise LGTM but please fix your commit message,
remove Committer: Gerben Damave <gerben@hephaestus.s8n.nl> 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.

[TomSweeneyRedHat]

LGTM once signed and other DCO issues are addressed.

[packit-as-a-service]

Ephemeral COPR build failed. @containers/packit-build please check.

[packit-as-a-service]

Ephemeral COPR build failed. @containers/packit-build please check.

[geraveoyomama]

there are some build failures. But from the logs I do not see how I can fix them

[ygalblum]

@geraveoyomama Please rebase on top of main. I hope this will fix these issues

[openshift-ci]

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