I have created a composite GitHub action and placed it in a private repository so that I can reference it in multiple projects. The private repo consists only of the action.yml file at the top level.

In another repository, I am referencing this composite action with the following yaml:

jobs:
  notify_slack:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout slack notifer action
        uses: actions/checkout@v2
        with:
          repository: my-org/slack-notifier
          ref: main
          token: ${{ secrets.PAT_TOKEN }}
          path: ./.github/actions/slack-notifier
  - name: Notify Slack
    uses: ./.github/actions/slack-notifier
    with:
      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

When I run the action. The Notify Slack action succeeds, however, the Post Notify Slack action fails.

image2488×770 69 KB

I am do not understand what action.yml this error is referencing because it was able to find the action.yml to run the Notify Slack step. It does successfully post to Slack.