Reuse downloaded terraform version between multiple actions

[donovanmuller]

If you combo multiple actions together in a single job, the Terraform version is downloaded for every action. It would be beneficial to share the same Terraform version between actions. I.e. The first action downloads terraform if the binary doesn't exist and the same version is reused in subsequent actions.

E.g. workflow

...
jobs:
  cluster:
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Get branch name
        uses: nelonoel/branch-name@v1.0.1

      - name: Use branch workspace
        uses: dflook/terraform-new-workspace@v1
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        with:
          path: blah
          workspace: ${{ env.BRANCH_NAME }}

      - name: Create cluster
        uses: dflook/terraform-apply@v1
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        with:
          workspace: ${{ env.BRANCH_NAME }}
          path: blah
          auto_approve: true

results in two downloads:

Run dflook/terraform-new-workspace@v1
...

Reading latest terraform version
Downloading https://releases.hashicorp.com/terraform/0.14.4/terraform_0.14.4_linux_amd64.zip to terraform_0.14.4_linux_amd64.zip
Downloading ...
33518568 bytes downloaded.
Switched terraform to version "0.14.4" 

...

Run dflook/terraform-apply@v1
...

Reading latest terraform version
Downloading https://releases.hashicorp.com/terraform/0.14.4/terraform_0.14.4_linux_amd64.zip to terraform_0.14.4_linux_amd64.zip
Downloading ...
33518568 bytes downloaded.
Switched terraform to version "0.14.4" 

[dflook]

Hi @donovanmuller, thanks for creating an issue. This is a good idea.

[dflook]

Release v1.5.2 will only download the terraform binary once per job, if required. The terraform version included in the image has also been updated to 0.14.4.