Install libmnl and libnftnl on CI containers #7

	---
	name: Git - Check commit message style
	on:
	push:
	workflow_dispatch:

	jobs:
	check-commit-message-style:
	name: Check commit message style
	runs-on: ubuntu-latest
	steps:
	# Make sure there are no whitespaces other than space, tab and newline in a commit message.
	- name: Check for unicode whitespaces
	uses: gsactions/commit-message-checker@16fa2d5de096ae0d35626443bcd24f1e756cafee #v2.0.0
	with:
	# Pattern matches strings not containing weird unicode whitespace/separator characters
	# \P{Z} = All non-whitespace characters (the u-flag is needed to enable \P{Z})
	# [ \t\n] = Allowed whitespace characters
	pattern: '^(\P{Z}\|[ \t\n])+$'
	flags: 'u'
	error: 'Detected unicode whitespace character in commit message.'
	checkAllCommitMessages: 'true' # optional: this checks all commits associated with a pull request
	accessToken: ${{ secrets.GITHUB_TOKEN }} # only required if checkAllCommitMessages is true

	# Git commit messages should follow these guidelines: https://cbea.ms/git-commit/
	- name: Check against guidelines
	uses: mristin/opinionated-commit-message@f3b9cec249cabffbae7cd564542fd302cc576827 #v3.1.1
	with:
	# Commit messages are allowed to be subject only, no body
	allow-one-liners: 'true'
	# This action defaults to 50 char subjects, but 72 is fine.
	max-subject-line-length: '72'

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