Fix maturin installation to use uv pip in uv-managed environments

The build hook now checks for uv and uses 'uv pip install maturin'
instead of 'python -m pip install maturin' when uv is available.
This fixes the build failure in GitHub Actions where uv manages
the Python environment.

Author: aclark4life

hatch_build.py

@@ -42,11 +42,19 @@ def _build_rust_extension(self, here: Path, *, required: bool = False) -> bool:
         # Check if maturin is available
         if not shutil.which("maturin"):
             try:
-                subprocess.run(
-                    [sys.executable, "-m", "pip", "install", "maturin"],
-                    check=True,
-                    capture_output=True,
-                )
+                # Try uv pip first, fall back to pip
+                if shutil.which("uv"):
+                    subprocess.run(
+                        ["uv", "pip", "install", "maturin"],
+                        check=True,
+                        capture_output=True,
+                    )
+                else:
+                    subprocess.run(
+                        [sys.executable, "-m", "pip", "install", "maturin"],
+                        check=True,
+                        capture_output=True,
+                    )
             except subprocess.CalledProcessError as e:
                 msg = f"Failed to install maturin: {e}"
                 if required: