export_default_credentials: true isn't setting $GOOGLE_APPLICATION_CREDENTIALS for later steps

TL;DR

I set export_default_credentials: true, and in later steps test failed due to missing credentials.

Expected behavior $GOOGLE_APPLICATION_CREDENTIALS should be set with the credentials for all later steps.

Reproduction

Action YAML

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v1
    - uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
      with:
       version: '270.0.0'
       service_account_email: ${{ secrets.GCP_SA_STG_EMAIL }}
       service_account_key: ${{ secrets.GCP_SA_STG_KEY }}
       export_default_credentials: true
    - name: set gcp cradentilas
      run:  gcloud info
    - name: echo gcp cradentilas
      run:  echo this is  ${GOOGLE_APPLICATION_CREDENTIALS}  
    - uses: actions/checkout@v2
    - name: Set up JDK 1.8
      uses: actions/setup-java@v1
      with:
        java-version: 1.8
    - name: Build with Maven
      run: mvn clean install --file pom.xml

Additional information I submitted in the past some PR that fixed it, when I run same action with that PR branch it works.

[sethvargo]

@brachi-wernick remove the second actions/checkout@v2. Performing a checkout resets the workspace, effectively deleting the cached credentials. Again, this works with your PR because the credentials are saved outside of the workspace.

• Commit: https://github.com/sethvargo/github-actions/commit/d53115e11595ae03ee49038f99ce7bc2cd2c22d2
• “Successful” run: https://github.com/sethvargo/github-actions/runs/550149962?check_suite_focus=true

Note: the run failed because I do not have access to your bucket. However, the authentication is clearly selected as the error message now includes the service account name.

Please let me know if you have additional questions.

[brachi-wernick]

Hi @sethvargo. that helps! it works now! thanks on your help!