Tweak CI

[shonfeder]

Closes #7

• Use the opam-ci-check from the live branch
• Use the --quiet flag
• This picks up the additions and improvements added to the linter in Add lint checks for the archive repo ocurrent/opam-repo-ci#412

[shonfeder]

I've tested this in #6 via #9 . There you can see

• A passing test when that is expected: https://github.com/ocaml/opam-repository-archive/actions/runs/12731224684/job/35484986427
• A failing test when an invalid archiving reason is added: https://github.com/ocaml/opam-repository-archive/actions/runs/12731319502/job/35485176938

[hannesm]

looks fine, thanks.