Add support for the [OCI CLI spec](https://github.com/opencontainers/runtime-spec/pull/513). Use an existing Go package for command and options handling like e.g. [github.com/urfave/cli](https://github.com/urfave/cli).
Add support for the OCI CLI spec.
Use an existing Go package for command and options handling like e.g. github.com/urfave/cli.