Test enable groups as specified by PR labels (#2357)

* Allow CIBW_ENABLE to control the wheels built in testing

* Set CIBW_ENABLE using PR labels

* Add docs

* Build everything on the main branch

* Add CIBW_ENABLE=all option

This was mostly for use in the `main` building case, because otherwise it's maybe a bit too easy to forget to update this file when adding an enable group

* Remove dead code

* Make unit tests robust to the value of CIBW_ENABLE

* Fix tests that explicitly choose pypy

* Fix test expectation

* Don't expect impossible wheels in expected_wheels

* Simplify logic in expected_wheels

* CircleCI- run with CIBW_ENABLE=all only on the main branch

* Azure pipelines - run with CIBW_ENABLE=all on main branch

* Update gitlab to run CIBW_ENABLE=all on main

* Set CIBW_ENABLE=all on travis - it only runs on main anyway

* Fix job name error on CircleCI

* Fix tests for graalpy

* Update the test configuration to use the label

* Remove duplication of default value. Make it affect sample build too

* Move the action to after deps are installed

* GraalPy workaround for this assumption

* Make unit test resilient to changing CIBW_ENABLE

unit_test/main_tests/main_options_test.py

@@ -329,6 +329,7 @@ def test_config_settings(platform_specific, platform, intercepted_build_args, mo
 @pytest.mark.usefixtures("platform", "intercepted_build_args", "allow_empty")
 def test_build_selector_deprecated_error(monkeypatch, selector, pattern, capsys):
     monkeypatch.setenv(selector, pattern)
+    monkeypatch.delenv("CIBW_ENABLE", raising=False)
 
     if selector == "CIBW_BUILD":
         with pytest.raises(SystemExit) as ex:
@@ -422,6 +423,8 @@ def test_debug_traceback(monkeypatch, method, capfd):
 
 @pytest.mark.parametrize("method", ["unset", "command_line", "env_var"])
 def test_enable(method, intercepted_build_args, monkeypatch):
+    monkeypatch.delenv("CIBW_ENABLE", raising=False)
+
     if method == "command_line":
         monkeypatch.setattr(sys, "argv", [*sys.argv, "--enable", "pypy", "--enable", "graalpy"])
     elif method == "env_var":
@@ -437,6 +440,15 @@ def test_enable(method, intercepted_build_args, monkeypatch):
         assert enable_groups == frozenset([EnableGroup.PyPy, EnableGroup.GraalPy])
 
 
+def test_enable_all(intercepted_build_args, monkeypatch):
+    monkeypatch.setattr(sys, "argv", [*sys.argv, "--enable", "all"])
+
+    main()
+
+    enable_groups = intercepted_build_args.args[0].globals.build_selector.enable
+    assert enable_groups == EnableGroup.all_groups()
+
+
 def test_enable_arg_inherits(intercepted_build_args, monkeypatch):
     monkeypatch.setenv("CIBW_ENABLE", "pypy graalpy")
     monkeypatch.setattr(sys, "argv", [*sys.argv, "--enable", "cpython-prerelease"])