title: How to convert String to Array and put it in github actions matrix?
body: <p>I have GitHub actions two jobs. One is running a python script to get a list [[file1, 1.0], [file2, 3.0]] and the other is to put this list in the GitHub actions matrix. But I got from python script is a string and it cannot be put into matrix. How to solve this?</p>
  <pre><code>on:
    pull_request:
      branches: [ master, develop ]
      types: [ closed ]
  
  jobs:
    compute-version:
      runs-on: ubuntu-latest
      
      outputs:
        list: ${{ steps.semver.outputs.list }}
      
      steps:
        - name: Run Computer Version Script
          id: semver
          run: |
            python ./.github/bump-version.py $GITHUB_REF
            res=$?
            echo &quot;::set-output name=list::$res&quot;
            
    update-yaml:
      needs: compute-version
      
      runs-on: ubuntu-latest
      
      strategy:
            matrix:
              node: ${{needs.compute-version.outputs.bump_list}}
  
      steps:
        - name: Checkout
          uses: actions/checkout@v2
        
        - name: Update Version on Yaml File
          uses: fjogeleit/yaml-update-action@master
          with:
            valueFile: ${{ matrix.node['file'] }}
            propertyPath: info.version
            value: ${{ matrix.node['version'] }}
            commitChange: true
            updateFile: true
            targetBranch: ${{needs.compute-version.outputs.target_branch}}
            masterBranchName: master
            createPR: false
            branch:  ${{needs.compute-version.outputs.target_branch}}
            message: Bump version to ${{ matrix.node['version'] }} in ${{ matrix.node['file'] }}
  </code></pre>