Cirrus M1 macOS runners never start on fork

[nineteendo]

The Cirrus M1 macOS runners introduced in #119979 never start on my fork. This causes every workflow to fail. Can we skip this job in that case?

Linked PRs

• gh-120111: Don't use cirrus M1 macOS runners on fork #120116
• [3.13] gh-120111: Don't use cirrus M1 macOS runners on fork (GH-120116) #120152
• [3.12] gh-120111: Don't use cirrus M1 macOS runners on fork (GH-120116) #120153

[hugovk]

Yes, does something like this in .github/workflows/reusable-macos.yml work?

  build_macos:
    name: 'build and test'
    if: |
      github.repository_owner != 'python'
      && matrix.os == 'ghcr.io/cirruslabs/macos-runner:sonoma'

[nineteendo]

Didn't work.

[nineteendo]

Currently trying this:

      matrix:
        os: ${{fromJson(inputs.os-matrix)}}
        isFork: ${{ github.repository_owner != 'python' }}
        exclude:
          - isFork: true
            os: 'ghcr.io/cirruslabs/macos-runner:sonoma'

isFork needs to be an array.