nextcloud: restore app files for maintenance job

scripts/nextcloud-maintenance.sh

@@ -15,6 +15,14 @@ run_occ() {
 
 log() { echo "[$(date -Is)] $*"; }
 
+log "Ensuring Nextcloud app files are present"
+if [[ ! -d /var/www/html/lib && -d /usr/src/nextcloud/lib ]]; then
+  rsync -a --delete \
+    --exclude config \
+    --exclude data \
+    /usr/src/nextcloud/ /var/www/html/
+fi
+
 log "Applying Atlas theming"
 run_occ config:app:set theming name --value "Atlas Cloud"
 run_occ config:app:set theming slogan --value "Unified access to Atlas services"