cmd: add executor flag to run and twerk commands.
cmd: add executor flag to run and twerk commands.

The default will continue to be "chroot" until runc binary provisioning is handled, but then will likely switch to that.

Signed-off-by: Eric Myhre <2346ad27d7568ba9896f1b7da6b5991251debdf2@exultant.us>

heavenlyhash/r200,polydawn/repeatr,polydawn/repeatr,heavenlyhash/r200