[WIP] fix CI

[gelisam]

No description provided.

[gelisam]

stack and cabal both fail. focusing on cabal first. that's the CI check named "newest".

the failure is that cabal cannot find a build plan, rejecting: ghc-9.10.1/installed-69c3 (conflict: hint => ghc>=8.4 && <9.9). are we building with ghc-version: latest, but hint does not yet support ghc-9.10.1? no, the CI script is using ghc-version: 9.8.1, but in a convoluted way:

  cabal:
    name: newest
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - ghc-version: '9.8.1'
            os: ubuntu-latest

    steps:
    - uses: actions/checkout@v2

    - uses: haskell-actions/setup@v2
      id: setup-haskell-cabal
      name: Setup Cabal
      with:
        ghc-version: ${{ matrix.ghc }}
        cabal-version: ${{ matrix.cabal }}

the fact that the matrix configuration does not specify a value for cabal looks suspicious. what happens if we remove the matrix-related complications?

[gelisam]

that worked! is it the missing cabal field?

[gelisam]

It was not the missing cabal field. What else is wrong with the matrix then? Let's try the example matrix from haskell/actions...

[gelisam]

the example works. so what's the difference between the example matrix and my matrix?