feat(android): add Rust target to environment setup

Author: ririv

cibuildwheel/platforms/android.py

@@ -397,6 +397,7 @@ def setup_rust_cross_compile(
     env: MutableMapping[str, str],
 ) -> None:
     cargo_target = android_triplet(python_configuration.identifier)
+    call("rustup", "target", "add", cargo_target)
 
     # CARGO_BUILD_TARGET is the variable used by Cargo and setuptools_rust
     if env.get("CARGO_BUILD_TARGET"):