refactor: use enum instead of string values to acces platform archive… #256

Job	Run time
windows / setup	41s
linux / setup	13s
macos / setup	18s
linux / build-examples (gcc)	22s
linux / build-examples (gcc, -W -cstrict)	26s
linux / test (gcc)	1m 12s
linux / build-examples (clang)	22s
linux / test (clang)	44s
linux / build-examples (clang, -W -cstrict)	22s
linux / lint / fmt	4s
linux / lint / vet	4s
macos / build-examples (clang)	17s
macos / build-examples (clang, -W -cstrict)	18s
windows / build-examples (gcc)	1m 37s
windows / build-examples (gcc, -W -cstrict)	1m 38s
	8m 38s

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