Read from standard input

[Hipska]

It would be nice to be able to read images piped from stdin to be able to chain commands without storing intermediate files on the local filesystem.

Example usage:

docker buildx build -o type=docker,dest=- . | docker scout cves archive://stdin
docker buildx build -o type=docker,dest=- . | docker scout quickview archive://-
docker buildx build -o type=docker,dest=- . | docker scout recommendations -