make external boot test work for windows

Author: rickeylev

tests/py_zipapp/system_python_zipapp_external_bootstrap_test.sh

@@ -1,13 +1,17 @@
 #!/usr/bin/env bash
 
-set -euo pipefail
+set -xeuo pipefail
 
 # This test expects ZIPAPP env var to point to the zipapp file.
 if [[ -z "${ZIPAPP:-}" ]]; then
   echo "ZIPAPP env var not set"
   exit 1
 fi
 
+# On Windows, the executable file is an exe, and the .zip is a sibling
+# output.
+ZIPAPP="${ZIPAPP/.exe/.zip}"
+
 # We're testing the invocation of `__main__.py`, so we have to
 # manually pass the zipapp to python.
 "$PYTHON" "$ZIPAPP"