Refactor (ci): Standardize `ln` parameters in `build/Dockerfile` #603

Job	Run time
test-game-image-game-version	2s
test-generate-gitbranches	29s
test-build-hlds	1m 46s
test-build-srcds	1m 23s
dockerhub-description-srcds	0s
update-draft-release	0s
publish-draft-release	0s
dockerhub-description-hlds	0s
	3m 40s

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