How to make it fail on warning?

[Anoncheg1]

That is how I use it:
https://github.com/Anoncheg1/selected-window-contrast/blob/main/.github/workflows/melpazoid.yml

env:
          LOCAL_REPO: ${{ github.workspace }}
          # RECIPE is your recipe as written for MELPA:
          RECIPE: (selected-window-contrast :fetcher github :repo "Anoncheg1/selected-window-contrast")
          # set this to false (or remove it) if the package isn't on MELPA:
          # EXIST_OK: false
        run: echo $GITHUB_REF && make -C ~/melpazoid

What should I set to make it error at any warning and crash Github Action run?

What customizations are possible?

[riscy]

What should I set to make it error at any warning and crash Github Action run?

Currently there's no support for this - here's the current logic.

But it would be a pretty easy code change to make warnings turn into CI build failures (maybe behind some flag). I could see this being useful and I can look at building that in.

[Anoncheg1]

Workaround:

        run: |
          echo $GITHUB_REF
          if make -C ~/melpazoid |& tee output.log; then
            if grep -q "Warning" output.log; then
              echo "Warnings detected, failing workflow"
              exit 1
            fi
          else
            echo "Make command failed, failing workflow"
            exit 1
          fi