fix: work around Wine build isolation failure in generate_release

On POSIX (Wine), pip's isolated build environment can't import
setuptools.build_meta. Install setuptools and wheel first, then
use --no-build-isolation for requirements.txt.

Also add python/ to .gitignore.

.gitignore

@@ -10,6 +10,7 @@ __pycache__/
 *$py.class
 *.so
 .Python
+python/
 
 # -----------------------------------------------------------------------------
 # Virtual Environments