build guest image dynamically #925

Job	Run time
app-test (ubuntu-latest, aarch64)	5m 28s
app-test (ubuntu-latest, riscv64)	5m 27s
app-test (ubuntu-latest, x86_64)	6m 29s
app-test (ubuntu-latest, loongarch64)	5m 10s
unit-test	56s
	23m 30s

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