Simplify variant selection #3274

Job	Run time
Determine compiler version from git tag	1s
Ubuntu dev container/Debug	30m 37s
Native: macos-13/debug/Ninja	44m 19s
Ubuntu dev container/Release	20m 39s
Native: macos-13/debug/Xcode	24m 7s
Native: macos-13/release/Ninja	27m 58s
Native: macos-13/release/Xcode	17m 33s
Native: ubuntu-latest/debug/Ninja	30m 39s
Native: ubuntu-latest/release/Ninja	19m 47s
Native: windows-latest/debug/Ninja	11m 28s
Native: windows-latest/release/Ninja	16m 56s
	4h 4m 4s

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