Set the output environment variable on failure (#7)

main.py

@@ -189,6 +189,10 @@ def execute_command(command):
                 err.returncode, err.with_traceback, err.output
             )
         )
+
+        if err.returncode == 2:
+            return err.output
+
         raise
     except Exception as err:
         print(f"Unexpected {err=}, {type(err)=}")
@@ -215,4 +219,4 @@ def set_github_action_output(output_name, output_value):
     except Exception as e:
         traceback.print_exc()
         print(f"ERROR: Unexpected error occurred. {str(e)}", file=sys.stderr)
-        exit(1)
+        exit(1)