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Use Github Actions with a JSON file as input for a matrix

You can use a JSON file as input for the strategy matrix by using the following as the workflow file inside .github/workflows/main.yml:

name: main
on: push

jobs:
  configure:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
     - name: Checkout to repository
       uses: actions/checkout@v3
     - name: Set matrix data
       id: set-matrix
       run: echo "matrix=$(jq -c . < ./config.json)" >> $GITHUB_OUTPUT

  print:
    runs-on: ubuntu-latest
    needs: configure
    strategy:
      matrix: ${{ fromJson(needs.configure.outputs.matrix) }}
    steps:
     - run: echo ${{ matrix.name }}

where the configuration should be written with the include key explicitly in the root folder in config.json:

{
    "include": [
    {
        "name": "Mario"
    },
    {
        "name": "Luigi"
    }
    ]
}

To test this locally I have used act by simply running act in the root directory of the repository.

Github Actions JSON CICD
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