ci: Make fedora-45 (rawhide) package build non-gating

We want to test on rawhide, but it can't be gating.

Assisted-by: opencode (claude-opus-4-6)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

.github/workflows/ci.yml

@@ -184,6 +184,8 @@ jobs:
         test_os: ${{ fromJson(needs.compute-ci-level.outputs.package_os_matrix) }}
 
     runs-on: ubuntu-24.04
+    # Rawhide is best-effort; don't let it block merges
+    continue-on-error: ${{ matrix.test_os == 'fedora-45' }}
 
     steps:
       - uses: actions/checkout@v7