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/templates/mxos-trigger-dist-repo.sh.j2

@@ -0,0 +1,22 @@
+#!/usr/bin/bash
+# SPDX-License-Identifier: MIT-0
+set -euo pipefail
+
+TAG="{{ koji_build_tag }}"
+KEY_ID="$1"
+LOG_FILE="/var/log/mxos-dist-repo-trigger.log"
+
+# Log all output to log file
+exec > >(tee -a "$LOG_FILE") 2>&1
+
+echo "[$(date -Iseconds)] Triggering dist-repo for tag $TAG with key $KEY_ID..."
+
+# Run dist-repo task in Koji and wait for it to complete
+if /usr/bin/sudo -u kojiadmin /usr/bin/koji dist-repo "$TAG" "$KEY_ID" \
+    --with-src --split-debuginfo --write-signed-rpms --allow-missing-signatures --wait; then
+    echo "[$(date -Iseconds)] dist-repo completed successfully. Invoking repository synchronization..."
+    /usr/local/bin/mxos-repo-sync.sh
+else
+    echo "[$(date -Iseconds)] dist-repo task failed. Skipping repository synchronization." >&2
+    exit 1
+fi