Matrix: how to Cartesian-product the include with the other variables

[Pr0methean]

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For https://github.com/Pr0methean/zip-next/actions/runs/8696381767, I defined the following matrix:

jobs:
  build_and_test:
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest, windows-latest]
        include:
        - rustalias: stable
          rust: stable
        - rustalias: msrv
          rust: '1.70'
        - rustalias: nightly
          rust: nightly
    name: Build and test (${{ matrix.os }}, ${{ matrix.rustalias }})

I expected this to produce 9 build-and-test jobs, but it only produces 3 (the ones that use nightly). I got the same results with a dummy-variable workaround to make the variable sets overlap:

jobs:
  build_and_test:
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest, windows-latest]
        singleton: [1]
        include:
        - singleton: 1
          rustalias: stable
          rust: stable
        - singleton: 1
          rustalias: msrv
          rust: '1.70'
        - singleton: 1
          rustalias: nightly
          rust: nightly
    name: Build and test (${{ matrix.os }}, ${{ matrix.rustalias }})

How do I fix this so that build-and-test generates 9 jobs, and the ones that use Rust 1.70 have msrv rather than 1.70 in their names so that I can include them forward-compatibly as PR required checks in my ruleset?

[Pr0methean]

Update: I finally got this working by copying one of the variables from the include list into the parent matrix tag, like so:

  build_and_test:
    strategy:
      matrix:
        os: [ubuntu-latest, macOS-latest, windows-latest]
        rustalias: [stable, nightly, msrv]
        include:
        - rustalias: stable
          rust: stable
        - rustalias: msrv
          rust: '1.70'
        - rustalias: nightly
          rust: nightly
    name: 'Build and test: ${{ matrix.os }}, ${{ matrix.rustalias }}'

But the fact that include can't increase the total number of workflows really needs to be documented somewhere!

[Pr0methean]

NB: It's possible the issue only affects workflows that need to have explicit full names -- but any CI check does if it's to be used in a ruleset with other forward-compatible variables.

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