Jenkins Emailext plugin default template: Passing in user defined variable into template - jenkins

Question

I am trying to edit the given groovy template file given for the emailext plugin to display Jenkins environment variables. The code I am experimenting is:
pipeline {
agent {
label 'main'
}
environment {
test = "This is a test line."
}
stages {
stage('Debug') {
steps {
sh 'printenv'
sh "echo ${env.test}"
bat 'echo %test%'
}
}
}
post {
always {
echo "Emailing.."
emailext body: '''${SCRIPT, template="groovy-html-edited.template"}''',
subject: currentBuild.currentResult + " : " + env.JOB_NAME,
to: 'example#email.com'
}
}
}
What I want is to be able to display the value of the pipeline environment variable within the email sent to the email address. Within the groovy template, I have tried using the following in an edited groovy template file:
${env.test}
${ENV.test}
${ENV,var="test"}
${env,var="test"}
Within the groovy-html-edited.template, the portion I've added for testing is:
<!-- TEST SECTION-->
<table class="section">
<tr class="tr-title">
<td class="td-title-main" colspan=2>
TEST SECTION
</td>
</tr>
<tr>
<td>${ENV,var='test'}</td>
</tr>
</table>
<br/>
What is the correct variable name to get a pipeline environment variable within the groovy template?

Answer 1

Here is an example of getting env vars from a pipeline within script template:
<%
import hudson.Util
import hudson.Functions
import hudson.model.Result;
import hudson.model.Build
//get data from pipeline
def envOverrides = it.getAction("org.jenkinsci.plugins.workflow.cps.EnvActionImpl").getOverriddenEnvironment()
%>
<!-- TEST SECTION-->
<table class="section">
<tr class="tr-title">
<td class="td-title-main" colspan=2>
TEST SECTION
</td>
</tr>
<tr>
<td>${envOverrides["test"]}</td>
</tr>
</table>
<br/>