fix: add Release and Translation files to apt repository

The apt repository hosted on GitHub Pages only contained Packages and
Packages.gz, causing apt-get update to emit noisy "Ign" and "Err 404"
warnings for the missing InRelease, Release, and Translation-en files.

While the install still succeeded (due to [trusted=yes] and Packages
being present), these errors are confusing for users and make it look
like something is broken.

Generate a proper Release file via apt-ftparchive and add an empty
Translation-en to satisfy apt's metadata expectations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: barnabasbusa

.github/workflows/update-package-repo.yml

@@ -70,6 +70,13 @@ jobs:
           dpkg-scanpackages --multiversion . > Packages
           gzip -9c Packages > Packages.gz
 
+          # Generate Release file to suppress apt "Ign" warnings
+          apt-ftparchive release . > Release
+
+          # Create empty Translation file to prevent 404 on Translation-en
+          touch Translation-en
+          gzip -9c Translation-en > Translation-en.gz
+
       - name: Update rpm repository
         run: |
           set -euo pipefail