feat: Create Runway config files if missing
What
Create Runway config files if missing
Why
A user may still not have a runway.yml or an env vars file, but we need
one for Terraform to run successfully. This is currently done by
ci-tasks
(see
https://gitlab.com/gitlab-com/gl-infra/platform/runway/ci-tasks/-/blob/11f634ded0b13920ef8e0cbec4fd5fc87bd6394c/deployment-project/runway.yml#L74).
We take over that responsibility so that it's done both locally and on
CI, and to further simplify ci-tasks
.