Test dependent packages workflow (JuliaPluto/Pluto.jl)

name: Test dependent packages
 
# based on https://github.com/SciML/SciMLBase.jl/blob/master/.github/workflows/Downstream.yml, thanks!
 
# this is the same as Test.yml
on:
    workflow_dispatch:
    push:
        paths-ignore:
            - 'frontend/**'
            - 'frontend-bundler/**'
            - 'frontend-dist/**'
            - 'frontend-dist-offline/**'
            - 'test/frontend/**'
            - '**.md'
        branches:
            - main
    pull_request:
        paths-ignore:
            - 'frontend/**'
            - 'frontend-bundler/**'
            - 'frontend-dist/**'
            - 'frontend-dist-offline/**'
            - 'test/frontend/**'
            - '**.md'
        branches-ignore:
            - release
 
env:
    JULIA_PLUTO_IGNORE_CDN_BUNDLE_WARNING: true
 
concurrency:
    group: ${{ github.workflow }}-${{ github.ref }}
    cancel-in-progress: true
 
jobs:
    test:
        name: ${{ matrix.package.repo }}
        runs-on: ${{ matrix.os }}
        timeout-minutes: 15
 
        strategy:
            fail-fast: false
            matrix:
                julia-version: ["1"]
                os: [ubuntu-latest]
                package:
                    - { user: JuliaPluto, repo: PlutoSliderServer.jl }
 
        steps:
            - uses: actions/checkout@v7
            - uses: julia-actions/setup-julia@v3
              with:
                  version: ${{ matrix.julia-version }}
                  arch: x64
            - uses: julia-actions/julia-buildpkg@v1
            - name: Clone Downstream
              uses: actions/checkout@v7
              with:
                  repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
                  path: downstream
            - name: Load this and run the downstream tests
              shell: julia --project=downstream {0}
              run: |
                  using Pkg
                  try
                    # force it to use this PR's version of the package
                    Pkg.develop(PackageSpec(path="."))  # resolver may fail with main deps
                    Pkg.update()
                    Pkg.test()  # resolver may fail with test time deps 
                  catch err
                    err isa Pkg.Resolve.ResolverError || rethrow()
                    # If we can't resolve that means this is incompatible by SemVer and this is fine
                    # It means we marked this as a breaking change, so we don't need to worry about
                    # Mistakenly introducing a breaking change, as we have intentionally made one
 
                    @info "Not compatible with this release. No problem." exception=err
                    exit(0)  # Exit immediately, as a success
                  end