[gen_gtkmm] Added support for generating gtkmm v3 & v4 #11

	name: gen_gtkmm_package_checker
	on:
	push:
	branches: [ main ]
	paths:
	- 'gen_gtkmm/**'
	- 'tests/**'
	- 'setup.py'
	pull_request:
	branches: [ main ]
	paths:
	- 'gen_gtkmm/**'
	- 'tests/**'
	- 'setup.py'
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.10']
	steps:
	- uses: actions/checkout@v4
	- name: Set up python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	pip install flake8
	- name: Lint with flake8
	run: \|
	pip install flake8
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide => strict 79
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=79 --statistics --max-doc-length 79

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