PR #14: Add 'bevel migrate' so bevel works on a fresh machine

Agent Instructions

Click a suite to see its builds. Example suite for 184afa20 :

https://staging.nix-ci.com/gh:NorfairKing:bevel/refs%2Fpull%2F14%2Fmerge/184afa201521090c35174e55ec0a881f8f8dd5a3

This page is also available in machine-friendly formats. Request one with the Accept header:

• curl --netrc -H 'Accept: application/json' https://staging.nix-ci.com/gh:NorfairKing:bevel/refs%2Fpull%2F14%2Fmerge
• curl --netrc -H 'Accept: text/markdown' https://staging.nix-ci.com/gh:NorfairKing:bevel/refs%2Fpull%2F14%2Fmerge

For more instructions, fetch https://staging.nix-ci.com/instructions .