Allow empty CI platforms key, change RPi.GPIO metadata

Author: srittau

lib/ts_utils/metadata.py

@@ -109,8 +109,6 @@ def read_stubtest_settings(distribution: str) -> StubtestSettings:
     assert _is_list_of_strings(extras)
     assert _is_list_of_strings(stubtest_requirements)
 
-    assert len(ci_platforms) > 0, f"ci_platforms is empty for {distribution!r}, use `skip = true` to skip stubtest"
-
     unrecognised_platforms = set(ci_platforms) - _STUBTEST_PLATFORM_MAPPING.keys()
     assert not unrecognised_platforms, f"Unrecognised ci_platforms specified for {distribution!r}: {unrecognised_platforms}"
 

stubs/RPi.GPIO/METADATA.toml

@@ -6,5 +6,5 @@ upstream_repository = "https://sourceforge.net/p/raspberry-gpio-python/code/"
 # itself as 'linux'. When run on other hardware, it raises a RuntimeError:
 # RPi.GPIO failed to import. RuntimeError: This module can only be run on a Raspberry Pi!
 # https://sourceforge.net/p/raspberry-gpio-python/code/ci/08048dd1894a6b09a104557b6eaa6bb68b6baac5/tree/source/py_gpio.c#l1008
-skip = true
-supported_platforms = ["linux"]
+supported_platforms = []
+ci_platforms = []