This is to demonstrate how you might combine Earthly and Terraform.
earthly -P +localstack
This target runs LocalStack and applies the Terraform to it. This is easy to do because it doesn't require a cloud to actually test applying your Terraform.
Requires privileged mode to spin up the LocalStack using DIND.
Saves the .tfstate to show how it can work with Earthly. It will not work on the next go around; because the LocalStack instance it was created in is gone.
earthly --build-arg AWS_ACCESS_KEY_ID --build-arg AWS_SECRET_ACCESS_KEY +plan
This target actually plans the Terraform against your cloud, if you pass in valid credentials. The region is optional, and can be overridden. Defaults to us-east-1.
earthly --push --build-arg AWS_ACCESS_KEY_ID --build-arg AWS_SECRET_ACCESS_KEY +apply
This target actually applies the Terraform against your cloud, if you pass in valid credentials. Like in +plan, the region is optional, and can be overridden.
Requires --push to actually run the apply. Saves the .tfstate files as artifacts. If it is your first run, you will need to comment out saving the .tfstate.backup, since you will not have one yet.