packaging/dependency management question for y'all: I'm hoping to migrate our metaflow infra onto pants (but you could sub bazel in here as well). Right now, pants can build a "pex", which is effectively the code + venv with all dependencies, bundled into one archive. Would it be possible to point the metaflow "bootstrap script" at a pex in s3 (as opposed to a python file)? If not possible today, any pointers on what would need to change in order to enable it?