Add support for securely passing ssh identity to docker build #331
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Some Dockerfile builds require ssh authentication to perform some operations. Most notably pulling dependencies from private repos. To avoid leaking the ssh credentials in the build layers, docker buildkit supports the
--ssh default
argument which does a pass-thru of the ssh-agent socket from the host to the builder. This PR defines a new parameterssh_identity
and if set, it temporarily spawns anssh-agent
during the docker build.