Automatically tag triage for new bug reports

[jkowall]

Modify the issue template to add trage tag in addition to the bug tag.

Description of the changes

Add the triage tag in addition to the bug tag

How was this change tested?

Not tested

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits

[yurishkuro]

I don't think this is the best approach. Templates are "suggestions", you can see their attributes passed in the URL which you can just delete (I often do that myself since I don't need / want to populate the complete bug report). To ensure that the label is always added, I would rather do it via GH actions, e.g. https://docs.github.com/en/actions/managing-issues-and-pull-requests/adding-labels-to-issues (even more powerful manipulation capabilities are available via actions/github-script)

NB: https://github.com/github/command this allows executing workflows based on "commands" added to the comments. Not immediately needed, but could be a nice way of transitioning issues between triaging state diagram. We can technically just change the labels manually, but doing so is invisible to people subscribed to the issue, whereas comments do send notifications.

NB2: before applying a triage label I would like to define a state machine diagram & procedure. We probably need more than one label.

NB3: I suspect the workflows can only be added at the repo level, not for the whole org.

[jkowall]

We are already using this method to tag as bug so this was merely adding another tag in the automation. Adding a GH action seems like overkill when we just want to add the tag when the issue is opened.

[yurishkuro]

The difference, to me, is that bug tag is fyi only, nothing depends on it. But triage tag is part of the workflow - if it's not added the issues can fall through the cracks. And if we don't have a workflow implemented, there is no value in the triage tag anyway.

[jkowall]

The purpose of the triage tag is to find the issues needing triage. Once the traige is done the tag is removed.