fix(dnf): set metadata_expire=1h on generated .repo (#551)

DNF defaults to a 48h metadata cache when metadata_expire is unset,
so users running `dnf install/reinstall claude-desktop` shortly after
a release see stale versions until either the cache expires or they
manually run `dnf clean expire-cache`.

Lower the cache TTL on the generated repo file so freshly published
releases propagate within an hour without user intervention.

Co-authored-by: Claude <claude@anthropic.com>

.github/workflows/ci.yml

@@ -674,6 +674,7 @@ jobs:
             'gpgcheck=1' \
             'repo_gpgcheck=1' \
             'gpgkey=https://pkg.claude-desktop-debian.dev/KEY.gpg' \
+            'metadata_expire=1h' \
             > rpm/claude-desktop.repo
 
       - name: Re-upload signed RPMs to GitHub Release