fmt code and make disk image in ext4 format #999

Job	Run time
app-test (ubuntu-latest, x86_64)	6m 49s
app-test (ubuntu-latest, loongarch64)	5m 45s
app-test (ubuntu-latest, aarch64)	6m 59s
app-test (ubuntu-latest, riscv64)	5m 49s
unit-test	56s
	26m 18s

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