Add a hint for the Docker running platform #72

Job	Run time
Build the image (linux/ppc64le, ubuntu-22.04)	47m 13s
Build the image (linux/s390x, ubuntu-22.04)	47m 11s
Build the image (linux/riscv64, ubuntu-22.04)	39m 23s
Build the image (linux/amd64, ubuntu-22.04)	7m 46s
Build the image (linux/arm64/v8, ubuntu-22.04-arm)	46m 48s
Build the image (linux/arm/v7, ubuntu-22.04-arm)	46m 47s
Build the image (linux/386, ubuntu-22.04)	8m 39s
Build the image (linux/arm/v6, ubuntu-22.04-arm)	38m 30s
	4h 42m 17s

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