Marvin toolkit container

[xuganyu96]

This is an attempt to make the Marvin attack analysis more reproducible for RustCrypto/RSA. The Dockerfile and entrypoint script are both rough proofs of concept. It would be great if the maintainers can suggest how we can handle the outputs of the analysis, whether to test rsa1024 and rsa4096, whether this should be part of CI/CD, among other things.

[tarcieri]

This looks fine to me. Will try it out locally.

[xuganyu96]

@tarcieri @dignifiedquire

This PR is ready for review. The main feature of this PR is a container that packages the Marvin toolkit. See the added README.md for how to build and run the container. Some notable features include:

1. CLI allows specifying -s <RSA_bits> -n <repeat>
2. Custom Cargo.toml for the test harness if custom version of RustCrypto/RSA and/or RustCrypto/crypto-bigint is needed
3. Preserve the generated keys, ciphertexts, and analysis results by copying them into a location that can be mounted into the host file system

[tarcieri]

Cool, I'll try to test it out soon