misleading comparison of GHActions w/ Jenkins

[drewcoo]

What is the current behavior?

This makes it seem like GHA supports matrices and Jenkins doesn't.

https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/migrating-from-jenkins-to-github-actions#building-with-multiple-operating-systems

What changes are you suggesting?

Jenkins has supported matrix builds in pipelines for about a year now.
https://www.jenkins.io/blog/2019/11/22/welcome-to-the-matrix/

Please update the comparison doc.

Additional information

I think this is cannonical-ish Jenkins pipeline that also matches your code sample linked above. (The indentation was like that in your code sample.)

pipeline {
agent none
stages {
  stage('Run Tests') {
    matrix {
      axes {
        axis {
          name: 'PLATFORM'
          values: 'macos', 'linux'
        }
      }
      agent { label "${PLATFORM}" }
      stages {
        stage('test') {
          tools { nodejs "node-12" }
          steps {
            dir("scripts/myapp") {
              sh(script: "npm install -g bats")
              sh(script: "bats tests")
            }
          }
        }
      }
    }
  }
}
}

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