Create a container image and associated script for building/running weaver without the need to install dependencies

[grantseltzer]

I think the initial workflow should be as follows:

• Run build script which creates a docker image containing all dependencies and the oster binary
• Have a run script which emulates the oster CLI except under the hood runs oster inside the container with the correct permissions for accessing the kernel facilities

Also can have the run script run the build script if it hasn't been run yet.

[grantseltzer]

This is also a prime opportunity to use Karn for generating a custom seccomp profile. If run inside the container (i.e. the run script) use the container runtime to enforce seccomp, if not use the karn library in code itself to enforce the privs.