Hi, I'm trying to make pulumi work via github actions:

steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-node@v2
        with:
          node-version: 14.x
      - name: Configure AWS Credentials
        uses: aws-actions/configure-aws-credentials@v1
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-region: us-east-1
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
      - name: Install Pulumi CLI
        uses: pulumi/action-install-pulumi-cli@v1.0.1
      - run: yarn
      - run: cat Pulumi.mystack.yaml
      - uses: pulumi/actions@v2
        with:
          parallel: 1
          command: preview
          stack-name: 'mystack'
          cloud-url: <s3://mybucket>
          comment-on-pr: true
          github-token: ${{ secrets.GITHUB_TOKEN }}
          work-dir: "path/to/subfolder"
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.ORG_AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.ORG_AWS_ACCESS_KEY_SECRET }}
          AWS_REGION: us-east-1

But I can't make it work. It keeps failing on:

##[debug]Configuration is loaded
##[debug]Pulumi CLI is available
##[debug]Logging into to <s3://mybucket>
##[debug]Working directory resolved at /home/runner/_work/path/to/subfolder
Error: code: 255
 stdout: 
 stderr: error: no stack named 'mystack' found

 err?:

Can someone please help? It works locally on my laptop, but not in CI

can you run

pulumi stack ls

from your local laptop? It may be that the login didn't happen correctly

Looks like I had 2 problems. 1. Bad bucket name 2. Wrong bucket permissions The problem is that I only got hints about these problems by dropping the action and using raw bash.