Extract release tag to an ENV #302

Job	Run time
Build the image (linux/riscv64, riscv64)	31s
Build the image (linux/s390x, s390x)	37s
Build the image (linux/arm64/v8, arm64)	31s
Build the image (linux/386, 386)	27s
Build the image (linux/amd64, amd64)	26s
Build the image (linux/arm/v7, armv7)	29s
Build the image (linux/ppc64le, ppc64le)	32s
Build the image (linux/arm/v6, armv6)	29s
	4m 2s

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