Set up testing and wheels for Windows on GitHub Actions (#8131)

* Move some Java tests into ci.sh

* Move C++ worker tests into ci.sh

* Define run()

* Prepare to move Python tests into ci.sh

* Fix issues in install-dependencies.sh

* Reload environment for GitHub Actions

* Move wheels to ci.sh and fix related issues

* Don't bypass failures in install-ray.sh anymore

* Make CI a little quieter

* Move linting into ci.sh

* Add vitals test right after build

* Fix os.uname() unavailability on Windows

Co-authored-by: Mehrdad <noreply@github.com>

python/setup.py

@@ -159,12 +159,15 @@ class build_ext(_build_ext.build_ext):
         source = filename
         destination = os.path.join(self.build_lib, filename)
         # Create the target directory if it doesn't already exist.
-        parent_directory = os.path.dirname(destination)
-        if not os.path.exists(parent_directory):
-            os.makedirs(parent_directory)
+        os.makedirs(os.path.dirname(destination), exist_ok=True)
         if not os.path.exists(destination):
             print("Copying {} to {}.".format(source, destination))
-            shutil.copy(source, destination, follow_symlinks=True)
+            if sys.platform == "win32":
+                # Does not preserve file mode (needed to avoid read-only bit)
+                shutil.copyfile(source, destination, follow_symlinks=True)
+            else:
+                # Preserves file mode (needed to copy executable bit)
+                shutil.copy(source, destination, follow_symlinks=True)
 
 
 class BinaryDistribution(Distribution):