Support use /dev/stdin as SOURCE path for image build #1775

Job	Run time
contrib-build	4m 9s
contrib-build-master	4m 0s
nydus-build-master	2m 35s
nydus-build	3m 4s
cargo-deny	3m 44s
nydus-unit-test	8m 8s
nydus-unit-test-coverage	4m 12s
benchmark-nydus-all-prefetch-master	56s
benchmark-nydus-filelist-prefetch-master	3m 43s
benchmark-nydus-no-prefetch-master	56s
benchmark-zran-all-prefetch-master	1m 21s
benchmark-zran-no-prefetch-master	1m 24s
benchmark-zran-no-prefetch	1m 16s
nydus-integration-test	11m 19s
benchmark-nydus-all-prefetch	58s
benchmark-nydus-filelist-prefetch	3m 59s
benchmark-nydus-no-prefetch	45s
benchmark-oci	1m 26s
benchmark-zran-all-prefetch	1m 34s
benchmark-compare	9s
benchmark-result	0s
	59m 38s

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