mrtest: add_packages: Handle case when sudo/doas fails (MR 22)

mrtest/add_packages.py

@@ -61,7 +61,7 @@ def run_apk_add(origin, mr_id, apk_paths):
 
     print("Installing packages...")
     logging.debug(f"+ {cmd}")
-    subprocess.run(cmd)
+    subprocess.run(cmd, check=True)
 
 
 def confirm_mr_id(origin, mr_id):
@@ -120,6 +120,10 @@ Please trigger again the MR {} to generate the packages.
         exit(0)
 
     apk_paths = extract_apks(zip_path, selection)
-    run_apk_add(origin, mr_id, apk_paths)
+    try:
+        run_apk_add(origin, mr_id, apk_paths)
+    except subprocess.CalledProcessError:
+        print("Failed to install packages!")
+        exit(1)
 
     print("All done! Use 'mrtest zap' to uninstall added packages.")