test_ukify: rework how --flakes argument is appended

The usual approach is to put 'addopts = --flakes' in setup.cfg. Unfortunately
this fails badly when pytest-flakes is not installed:
  ERROR: usage: test_ukify.py [options] [file_or_dir] [file_or_dir] [...]
  test_ukify.py: error: unrecognized arguments: --flakes

pytest-flakes is not packaged everywhere, and this test is not very important,
so let's just do it only if pytest-flakes is available. We now detect if
pytest-flakes is available and only add '--flakes' conditionally. This
unfortunately means that when invoked via 'pytest' or directly as
'src/ukify/test/test_ukify.py', '--flakes' will not be appended automatically.
But I don't see a nice way to achieve previous automatic behaviour.

(I first considered making 'setup.cfg' templated. But then it is created
in the build directory, but we would need it in the source directory for
pytest to load it automatically. So to load the file, we'd need to give an
argument to pytest anyway, so we don't gain anything with this more complex
approach.)

src/ukify/test/meson.build

@@ -1,7 +1,19 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
 if want_ukify and want_tests != 'false'
-   test('test-ukify',
-        files('test_ukify.py'),
-        env : test_env)
+        have_pytest_flakes = pymod.find_installation(
+                'python3',
+                required : false,
+                modules : ['pytest_flakes'],
+        ).found()
+
+        args = ['-v']
+        if have_pytest_flakes
+                args += ['--flakes']
+        endif
+
+        test('test-ukify',
+             files('test_ukify.py'),
+             args: args,
+             env : test_env)
 endif

src/ukify/test/setup.cfg

@@ -1,2 +0,0 @@
-[tool:pytest]
-addopts = --flakes

src/ukify/test/test_ukify.py

@@ -495,4 +495,4 @@ def test_pcr_signing2(kernel_initrd, tmpdir):
     assert len(sig['sha1']) == 6   # six items for six phases paths
 
 if __name__ == '__main__':
-    sys.exit(pytest.main([__file__, '-v']))
+    sys.exit(pytest.main(sys.argv))