fedora: install ethtool explicitly
Summary
Some fedora container images does not have ethtool installed by default. Therefore specify it on REQUIRED_PACKAGES as it is needed for test-core unit test.
Purpose
Fix a test-core unit test failing in some Fedora container images.
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
-
the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.