main/postmarketos-ui-cosmic: add openrc support

Aster Boeserequested to merge
JustSoup321/pmaports:cosmic-openrc into master

Adds the required subpackage to get COSMIC working out-of-the-box on OpenRC-based systems.

Depends on https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/91232 being built.

Signed-off-by: Aster Boese asterboese@mailbox.org

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