Trigger prod deployment if no Terraform changes

[bengerman13]

we have thorough acceptance tests on this app, so we are safe to deploy code-only changes to prod without human intervention

Acceptance Criteria

• GIVEN a new version of the broker code
  WHEN the version has passed staging acceptance tests
  AND the version does not trigger any changes in terraform
  THEN the version should trigger a production build
• GIVEN a new version of the broker code
  WHEN the version has passed staging acceptance tests
  AND the version triggers changes in terraform
  THEN the version should require human intervention to trigger a production deployment

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Security considerations

None