chriscunningham-trivago authored Mar 21, 2023 and Matt committed Mar 21, 2023

tfswitch attempts to install the `terraform` binary to `/app/bin/` but
this fails because the directory doesn't exist. Add this directory to
the Dockerfile.

In addition, bubble up the error which is passed to the
`TerraformVersionSwitchError` exception, which helped catch this.

Issue #356