[jenkins] How can I test a change made to Jenkinsfile locally?

Put your SSH key into your Jenkins profile, then use the declarative linter as follows:

ssh jenkins.hostname.here declarative-linter < Jenkinsfile

This will do a static analysis on your Jenkinsfile. In the editor of your choice, define a keyboard shortcut that runs that command automatically. In Visual Studio Code, which is what I use, go to Tasks > Configure Tasks, then use the following JSON to create a Validate Jenkinsfile command:

{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "Validate Jenkinsfile",
      "type": "shell",
      "command": "ssh jenkins.hostname declarative-linter < ${file}"
    }
  ]
}

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