Support use /dev/stdin as SOURCE path for image build #1776

Job	Run time
nydus-build	2m 33s
nydus-unit-test	6m 55s
contrib-build	4m 33s
contrib-build-master	3m 59s
nydus-build-master	3m 33s
cargo-deny	4m 49s
nydus-unit-test-coverage	4m 12s
benchmark-zran-no-prefetch-master	1m 3s
benchmark-zran-all-prefetch-master	1m 25s
benchmark-nydus-no-prefetch-master	39s
benchmark-nydus-all-prefetch-master	55s
benchmark-nydus-filelist-prefetch-master	4m 10s
benchmark-oci	1m 38s
benchmark-zran-no-prefetch	1m 10s
benchmark-nydus-filelist-prefetch	3m 34s
benchmark-nydus-all-prefetch	59s
benchmark-nydus-no-prefetch	39s
benchmark-zran-all-prefetch	1m 18s
nydus-integration-test	10m 13s
benchmark-result	0s
benchmark-compare	17s
	58m 34s

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