Fix upgrade script to deploy new files

scripts/upgrade

@@ -2,12 +2,16 @@
 set -euo pipefail
 source ./_common.sh
 
-systemctl stop "$app" 2>/dev/null || true
+app="${YNH_APP_INSTANCE_NAME:-albumik}"
+
 mkdir -p "$install_dir"
-rm -rf "$install_dir/backend" "$install_dir/web" "$install_dir/doc"
-cp -a backend web doc "$install_dir"/
+
+cp -a "$YNH_APP_BASEDIR/backend" "$YNH_APP_BASEDIR/web" "$YNH_APP_BASEDIR/doc" "$install_dir"/
+
 chown -R "$app:$app" "$install_dir"
+
 systemctl daemon-reload
-systemctl start "$app"
-systemctl reload nginx || true
-echo "Albumik upgraded"
+systemctl restart "$app"
+
+nginx -t
+systemctl reload nginx