Add `flutter-version-file` #21

Job	Run time
test_print_output	17s
test_cache (ubuntu-latest)	12s
test_cache (windows-latest)	1m 8s
lint_shellcheck	3s
test_channel (ubuntu-latest, stable)	34s
test_cache (macos-latest)	1m 5s
test_cache (macos-13)	1m 10s
test_channel (ubuntu-latest, beta)	44s
test_channel (ubuntu-latest, master)	42s
test_cache (macos-14)	28s
test_channel (windows-latest, stable)	1m 38s
test_channel (windows-latest, beta)	1m 42s
test_channel (windows-latest, master)	1m 38s
test_channel (macos-latest, stable)	1m 23s
test_channel (macos-latest, beta)	1m 14s
test_channel (macos-latest, master)	1m 29s
test_channel (macos-13, stable)	1m 33s
test_channel (macos-13, beta)	1m 5s
test_channel (macos-13, master)	1m 13s
test_channel (macos-14, stable)	47s
test_channel (macos-14, beta)	53s
test_channel (macos-14, master)	48s
test_channel (ubuntu-latest, main)	45s
	22m 31s

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