A new workspace from docker template does not source `.bashrc`

A new workspace created from the [docker](https://github.com/coder/coder/tree/main/examples/templates/docker) template does not source `.bashrc`

This prevents setting env variables or paths defined in `.bashrc`

Coder version : [v2.2.1-devel+fafecbd9b](https://github.com/coder/coder/commit/fafecbd9b3450fb7dd02c982d46d918c99beeb13)
