Feature (ci): Add `srcds/cs2` support #430

Job	Run time
test-build-srcds	1m 45s
test-build-hlds	0s
test-game-image-game-version	3s
dockerhub-description-hlds	0s
dockerhub-description-srcds	0s
update-draft-release	0s
publish-draft-release	0s
	1m 48s

Provide feedback