Initial chef run (e.g., via `vagrant up`) fails due incorrect Ruby version

[joe4dev]

Initially running chef (e.g., via vagrant up) produces the following error during the chef run:
Your Ruby version is 2.1.4, but your Gemfile specified 2.2.2

Cause: The environment variable for the freshly installed Ruby version isn't yet set for the current shell

Workaround: Reprovision with vagrant provision

Solution: Find a way to properly set the environment variable for the current chef run