tfaction v2 is a Single Action

If you look at the workflow in Getting Started, you can see that tfaction calls the same action multiple times with different values for the action input.

- uses: suzuki-shunsuke/tfaction@latest
  with:
    action: setup
# ...
- uses: suzuki-shunsuke/tfaction@latest
  with:
    action: terraform-init
# ...
- uses: suzuki-shunsuke/tfaction@latest
  with:
    action: plan

In tfaction v2, the action input switches the behavior of the action.

• setup: Pre-processing
• terraform-init: terraform init
• plan: terraform plan
• apply: terraform apply

For convenience, we sometimes refer to them by their action input value, such as "setup action."

Using a single action improves both performance and maintainability.