feat: implement automatic, atomic, and push-based repository synchronization

- Switched from systemd path monitoring to a custom wrapper script `mxos-trigger-dist-repo.sh` spawned by the Koji signing spooler.
- Wrapper script runs Koji `dist-repo` synchronously and triggers the `mxos-repo-sync.sh` script to perform an atomic rsync of packages to the Caddy server.
- Excluded reposerver from distro-sync to work around VM disk space constraints.
- Configured Koji tag `mxos0` to cancel older pending/running `distRepo` tasks when a new one is triggered.
- Verified successful repository generation, synchronization, and DNF resolution.

Co-developed-by: Gemini AI <renich+gemini@woralelandia.com>
Signed-off-by: Rénich Bon Ćirić <renich@woralelandia.com>

roles/koji_hub/files/koji-sign-spooler

@@ -244,6 +244,22 @@ def process_queue():
             try:
                 kojihub.context.cnx.commit()
                 logger.info(f"All signatures committed for build {build_id} ({build_nvr}).")
+
+                # Check tags and trigger dist-repo if tagged in mxos0
+                try:
+                    tags = list(kojihub.list_tags(build=build_id))
+                    tag_names = [t['name'] for t in tags]
+                    logger.info(f"Build {build_nvr} is tagged in: {tag_names}")
+                    if 'mxos0' in tag_names:
+                        short_key_id = sig_key_id[-8:].lower()
+                        logger.info(f"Triggering dist-repo for tag mxos0 with key {short_key_id}")
+                        dist_cmd = [
+                            '/usr/local/bin/mxos-trigger-dist-repo.sh', short_key_id
+                        ]
+                        subprocess.Popen(dist_cmd)
+                except Exception as e:
+                    logger.error(f"Failed to check tags/trigger dist-repo: {e}")
+
                 os.remove(file_path)
             except Exception as e:
                 logger.error(f"Failed to commit signatures to database: {e}")