build guest image dynamically #924

Job	Run time
app-test (ubuntu-latest, loongarch64)	5m 7s
unit-test	57s
app-test (ubuntu-latest, riscv64)	5m 36s
app-test (ubuntu-latest, aarch64)	5m 27s
app-test (ubuntu-latest, x86_64)	6m 18s
	23m 25s

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