Can I pass authentication output to a reusable workflow?

[rdhar]

Hi, thanks for sharing this super-handy action!

Summary

I was looking to pass the output of AWS credential authentication from caller.yml job to a subsequent reusable terraform.yml workflow.

This purpose serves to keep the reusable workflow as generic/un-opinionated as possible. It should use whatever environment variables output are passed in from the caller.yml, which might have different configure-aws-credentials steps.

Context

To ground this in something visual, here's an example of the caller.tf workflow:

jobs:
  authenticate:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      id-token: write

    steps:
      - name: Authenticate AWS
        uses: aws-actions/configure-aws-credentials@2
        with:
          aws-region: us-east-1
          role-to-assume: arn:aws:iam::123456789012:role/terraform

  terraform:
    needs: authenticate
    uses: ./.github/workflows/terraform.yml

Since the "Authenticate AWS" step is present within the authenticate job, I'd like to pass its output to the reusable terraform.yml workflow in the terraform job so it can provision resources in accordance with the credentials provided in caller.tf workflow.

Please feel free to let me know if I can help provide any more information.