Add `flutter-version-file` #31

Job	Run time
test_version_file (ubuntu-latest)	40s
lint_shellcheck	3s
test_cache (ubuntu-latest)	18s
test_channel (ubuntu-latest, stable)	39s
test_cache (windows-latest)	2m 28s
test_print_output	12s
test_channel (ubuntu-latest, beta)	43s
test_cache (macos-latest)	45s
test_channel (ubuntu-latest, master)	45s
test_cache (macos-13)	1m 5s
test_channel (windows-latest, stable)	1m 49s
test_cache (macos-14)	26s
test_channel (windows-latest, beta)	1m 59s
test_channel (windows-latest, master)	1m 48s
test_channel (macos-latest, stable)	58s
test_channel (macos-latest, beta)	1m 16s
test_channel (macos-latest, master)	1m 3s
test_channel (macos-13, stable)	1m 4s
test_channel (macos-13, beta)	1m 8s
test_channel (macos-13, master)	1m 40s
test_channel (macos-14, stable)	42s
test_channel (macos-14, beta)	43s
test_channel (macos-14, master)	42s
test_channel (ubuntu-latest, main)	46s
	23m 42s

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