Fix CI/CD build dependencies interactive prompt

- Add DEBIAN_FRONTEND=noninteractive to prevent apt prompts
- Add APT_LISTCHANGES_FRONTEND=none to disable package change notifications
- Change from apt to apt-get for better CI/CD compatibility
- Add apt-get update before installing build dependencies
- Add --no-install-recommends flag to reduce package count

This fixes the "Do you want to continue? [Y/n]" prompt that was
causing the libostree backport build to fail in the CI environment.

.forgejo/workflows/build-packages.yml

@@ -63,7 +63,10 @@ jobs:
       - name: Install build dependencies
         run: |
           cd /opt/Projects/ostree-backport-noble/ostree-${OSTREE_VERSION}
-          apt build-dep -y ./
+          export DEBIAN_FRONTEND=noninteractive
+          export APT_LISTCHANGES_FRONTEND=none
+          apt-get update
+          apt-get build-dep -y --no-install-recommends ./
 
       - name: Build libostree backport
         run: |