Enable a simple python-3.11 plan

Demonstrates how the `environment` key can be used for setting
a common environment variable for the whole plan.

main.fmf

@@ -2,3 +2,13 @@ contact:
     - Petr Šplíchal <psplicha@redhat.com>
     - Miro Hrončok <mhroncok@redhat.com>
 component: [python]
+require:
+  - gcc  # for extension building in venv and selftest
+  - gcc-c++ # for test_cppext
+  - gdb  # for test_gdb
+  - python3.11  # the test subject
+  - tox  # for venv tests
+  - virtualenv  # for virtualenv tests
+  - glibc-all-langpacks # for locale tests
+  - marshalparser  # for testing compatibility (magic numbers) with marshalparser
+  - rpm  # for debugging