ci(copr): Trigger release job only for non-prereleases (#4297)

Updated the CI workflow to ensure the release job runs only when a release is not marked as a prerelease. This prevents the release job from executing on prerelease events.

.github/workflows/ci-copr.yml

@@ -43,7 +43,8 @@ jobs:
     name: Release
     if:
       github.event_name == 'release' &&
-      startsWith(github.repository, 'LizardByte/')
+      startsWith(github.repository, 'LizardByte/') &&
+      github.event.release.prerelease == false
     needs:
       - call-copr-ci
     permissions: