Install a Flutter SDK in the publish workflow #435

Job	Run time
test_arch	14s
test_latest_patch_release (2.19)	11s
test_inferred_channels (2.12.0-29.10.beta)	9s
test_latest_patch_release (3)	11s
test (ubuntu-latest, 2.14.4)	28s
test_latest_patch_release (3.1)	11s
test_raw (ubuntu-latest, dev, raw)	10s
test (ubuntu-latest, stable)	20s
test_raw (ubuntu-latest, main, raw)	14s
test (ubuntu-latest, beta)	22s
test_raw (macos-latest, dev, raw)	11s
test (ubuntu-latest, dev)	21s
test_raw (macos-latest, main, raw)	15s
test (macos-latest, 2.14.4)	30s
test_raw (windows-latest, dev, raw)	16s
test (macos-latest, stable)	29s
test_raw (windows-latest, main, raw)	24s
test (macos-latest, beta)	24s
test (macos-latest, dev)	35s
test (windows-latest, 2.14.4)	41s
test (windows-latest, stable)	58s
test (windows-latest, beta)	36s
test (windows-latest, dev)	34s
	8m 44s

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