Add `inputs.cache-save-always` #123

Job	Run time
test-auto-nightly	2s
test-auto-nightly-with-explicit	4s
test-generate	2s
test (ubuntu-latest, nightly)	3s
test (ubuntu-latest, lts)	7s
test (ubuntu-latest, lts-20.2)	3s
test (ubuntu-latest, lts-19.33)	3s
test (ubuntu-latest, lts-18.28)	2s
test (ubuntu-latest, lts-16.31)	4s
test (ubuntu-latest, lts-12.26)	3s
test (macOS-latest, nightly)	4s
test (macOS-latest, lts)	8s
test (macOS-latest, lts-20.2)	4s
test (macOS-latest, lts-19.33)	6s
test (macOS-latest, lts-18.28)	6s
test (macOS-latest, lts-16.31)	5s
test (macOS-latest, lts-12.26)	5s
test (windows-latest, nightly)	8s
test (windows-latest, lts)	8s
test (windows-latest, lts-20.2)	13s
test (windows-latest, lts-19.33)	13s
test (windows-latest, lts-18.28)	9s
test (windows-latest, lts-16.31)	9s
test (windows-latest, lts-12.26)	9s
test-stack-yamls (stack-nightly.yaml)	3s
test-stack-yamls (stack.yaml)	4s
	2m 27s

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