Handle Missing Terraform CLI

[skorfmann]

When the Terraform CLI isn't installed:

⠋ downloading and generating providers...
Error: spawn terraform ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
    at onErrorNT (internal/child_process.js:467:16)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'spawn terraform',
  path: 'terraform',
  spawnargs: [ 'init' ]
}

Should be handled

[github-actions]

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