title: How to add sidecar MySQL in declarative Jenkins pipeline?
body: <p>I am setting up a PHP build system and needs to run a local instance of MySQL for executing tests. Currently I am using declarative pipeline syntax and using docker. Is it possible to run MySQL as a sidecar in declarative syntax ?</p>
  
  <p>If not any other method to run MySQL agent along with a custom docker image and execute migrations ?</p>