Temporary sh files created when using Script Content field for options Prepare an environment for the run or Inject environment variables to the build process from a freestyle job are not deleted.

I think that files created with createScriptFile() must be explicitly deleted in EnvInjectScriptExecutor.executeScriptContent(), https://github.com/jenkinsci/envinject-plugin/blob/master/src/main/java/org/jenkinsci/plugins/envinject/service/EnvInjectScriptExecutor.java#L83.