fix: Make sure wheelmaker uses the default shell env (#2477)

Clean macOS installs place `python` in `/usr/local/bin`, which is not
searched by default when calling `actions.run()`. This caused builds to
fail when they were executing python tools on an unmodified macOS host.

---------

Co-authored-by: Richard Levasseur <[email protected]>
Co-authored-by: Richard Levasseur <[email protected]>

Author: shs96c

CHANGELOG.md

@@ -56,7 +56,8 @@ Unreleased changes template.
 
 {#v0-0-0-fixed}
 ### Fixed
-* Nothing fixed.
+* (py_wheel) Use the default shell environment when building wheels to allow
+  toolchains that search PATH to be used for the wheel builder tool.
 
 {#v0-0-0-added}
 ### Added

python/private/py_wheel.bzl

@@ -514,6 +514,9 @@ def _py_wheel_impl(ctx):
         outputs = [outfile, name_file],
         arguments = [args],
         executable = ctx.executable._wheelmaker,
+        # The default shell env is used to better support toolchains that look
+        # up python at runtime using PATH.
+        use_default_shell_env = True,
         progress_message = "Building wheel {}".format(ctx.label),
     )
     return [