Feature (ci): Add `srcds/cs2` support #423

Job	Run time
test-build-srcds	1m 51s
test-game-image-game-version	3s
test-build-hlds	0s
dockerhub-description-hlds	0s
dockerhub-description-srcds	0s
update-draft-release	0s
publish-draft-release	0s
	1m 54s

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