Downgrade.yml

name: Downgrade

on:
  pull_request:
    branches:
      - main
    paths-ignore:
      - 'paper/**'
      - '.gitignore'
  workflow_dispatch:

# Cancel redundant CI tests automatically
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  downgrade_test:
    if: "!contains(github.event.head_commit.message, 'skip ci')"
    name: Downgrade ${{ matrix.os }} - Julia ${{ matrix.version }} - ${{ github.event_name }}
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        version:
          - '1.10' # current lts
        os:
          - ubuntu-latest
        arch:
          - x64
    steps:
      - uses: actions/checkout@v6
      - uses: julia-actions/setup-julia@v3
        with:
          version: ${{ matrix.version }}
          arch: ${{ matrix.arch }}
      - run: julia -e 'using InteractiveUtils; versioninfo(verbose=true)'
      - uses: julia-actions/cache@v3
      - uses: julia-actions/julia-downgrade-compat@v2
        with:
          skip: LinearAlgebra,SparseArrays,Statistics,Test
          projects: ., test
          mode: forcedeps
      # We run the tests manually instead of using julia-action/julia-builpkg and julia-action/julia-runtest or `Pkg.test`
      # because otherwise the downgraded Manifest.toml is not used in the tests under julia <v1.12
      # see also https://github.com/julia-actions/julia-downgrade-compat/blob/00f940b7be2b50389571ed016d603be561649103/README.md#L89
      - name: Run tests
        run: |
          julia --project=test --color=yes -e '
            import Pkg
            Pkg.develop(Pkg.PackageSpec(path=pwd()))
            Pkg.instantiate()
            Pkg.status(; mode = Pkg.PKGMODE_MANIFEST)
            include("test/runtests.jl")
          '