ci: Correctly copy appdata-xml

commit f22aa944
Author: Griefed <griefed@griefed.de>
Date:   Fri Jul 12 20:41:02 2024 +0200

    Remove key-stuff from tests workflow

commit 5852712f
Author: Griefed <griefed@griefed.de>
Date:   Fri Jul 12 20:39:00 2024 +0200

    Well, siging using pgp doesn't work

commit 7c3c526b
Author: Griefed <griefed@griefed.de>
Date:   Thu Jul 11 21:23:00 2024 +0200

    Copy pubkey to working dir, too

commit 7a488c43
Author: Griefed <griefed@griefed.de>
Date:   Thu Jul 11 21:01:36 2024 +0200

    Move instead of copy to ensure removal. Do not run on PRs

commit 3c1b86d6
Author: Griefed <griefed@griefed.de>
Date:   Wed Jul 10 21:54:27 2024 +0200

    Try and setup signing for AppImage nr2

commit 1cda6d6c
Author: Griefed <griefed@griefed.de>
Date:   Wed Jul 10 21:24:47 2024 +0200

    Whoops. Different IDs

commit d6354cad
Author: Griefed <griefed@griefed.de>
Date:   Wed Jul 10 21:22:57 2024 +0200

    AppImage Signing initial test