Don't auto install Terraform versions with tfenv.

I run tfenv inside a toolbox container and I install the Terraform
versions I want in the build process.

.bashrc

@@ -56,6 +56,7 @@ export PS1='\u@\h:\w\$ '
 export PYTHONSTARTUP=~/.config/pythonrc.py
 export PYTHON_GITLAB_CFG=~/.config/python-gitlab.cfg
 export REDISCLI_HISTFILE="$HOME/Documents/.rediscli_history"
+export TFENV_AUTO_INSTALL=false
 export VAGRANT_DEFAULT_PROVIDER="virtualbox"
 # shellcheck disable=SC1090,SC1091
 [ ! -f "$HOME/.bashrc.private" ] || . "$HOME/.bashrc.private"