As a user it would be nice with a Jira example

[buep]

That includes many examples on how to extract data from jira, as well as a nice layout example.

Maybe there is a public Jira instance to use as example, e.g. like the Jenkins Jira?

[buep]

The example should be propagated into the PAC container as well so there is something to run easily out of the box.

[JKrag]

The bare minimum for a jira sample would be something like the following:

# Release notes
The following JIRA issues were adressed in this release.

{% for task in tasks.referenced %}
## {{task.task_id}} [{{task.attributes.data.fields.issuetype.name}}]: {{task.attributes.data.fields.summary}}
{% for commit in task.commits %}
- {{commit.shortsha}}: {{commit.header}}
{% endfor %}
{% endfor %}

## Unreferenced 
The commits below did not reference any JIRA issues

{% for commit in tasks.unreferenced %}
- {{commit.shortsha}}: {{commit.header}} 
{% endfor %}

This is just as basic as our existing default template but just adds jira issue type and summary (issue title) to "prove" that we have actually received data from JIRA. (i.e. verify that it is working end-to-end).