feat: Add script to build lock file with Docker

[matthewfeickert]

Resolves #59

* Add lock.sh which uses a specified Docker image to build
  the lock file in to avoid operating system differences.
   - Nox is hard to work with in Docker, so use a manually typed
     set of shell commands over attempting to use nox inside the
     container.
   - Allow for emulation of linux/amd64 if docker runtime is other platform.
* Don't use full path in noxfile to avoid adding noise with local test
  builds.
* Add docker target to noxfile.
* Rebuild lock file using lock.sh.
* Update binder/runtime.txt to Python 3.10 to match the same runtime as the
  image that contains ROOT.
* Add build instructions to README.