Add COLCON_IGNORE marker to .gitignore (#10) #25

Job	Run time
pytest / setup	7s
pytest / pytest (macos-latest, 3.8)	1m 3s
pytest / pytest (macos-latest, 3.9)	45s
pytest / pytest (macos-latest, 3.10)	35s
pytest / pytest (macos-latest, 3.11)	39s
pytest / pytest (macos-latest, 3.12)	41s
pytest / pytest (ubuntu-22.04, 3.8)	1m 4s
pytest / pytest (ubuntu-22.04, 3.9)	1m 9s
pytest / pytest (ubuntu-22.04, 3.10)	1m 9s
pytest / pytest (ubuntu-22.04, 3.11)	4m 39s
pytest / pytest (ubuntu-22.04, 3.12)	3m 25s
pytest / pytest (windows-latest, 3.8)	2m 8s
pytest / pytest (windows-latest, 3.9)	1m 49s
pytest / pytest (windows-latest, 3.10)	1m 54s
pytest / pytest (windows-latest, 3.11)	1m 45s
pytest / pytest (windows-latest, 3.12)	1m 38s
pytest / pytest (ubuntu-20.04, 3.6)	34s
	25m 4s

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