Automates release note generation

[JBAhire]

Description

• Addresses Automate release notes generation for Hypertrace repos hypertrace#156
• Adds Gren bot (https://github.com/github-tools/github-release-notes#feed-gren-) to get create automatic release notes.
• Added this as a part of publish workflow in GitHub actions so it will automatically run every time we publish new release.
• Added .grenrc.js which formats the output of GREN bot according to our requirements.

Testing

These are updated release notes for latest release in this repo generated by Gren bot

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

This utility uses labels for grouping PRs into categories so please use appropriate labels in upcoming PRs.

In order to have splendidly generated release notes, we recommend to follow these conventions:

• Start the subject line with a verb (e.g. Change header styles)
• Use the imperative mood in the subject line (e.g. Fix, not Fixed or Fixes header styles)
• Limit the subject line to about 50 characters
• Do not end the subject line with a period
• Separate subject from body with a blank line
• Wrap the body at 72 characters
• Use the body to explain what and why not how

[kotharironak]

Do we need to keep this file in repo?

[JBAhire]

removed.

[kotharironak]

Do we need this step? If, yes, does someone has to create PR at the end?

[JBAhire]

This was to generate RELEASE_NOTES.md file. We don't explicitly need it and our branched are protected so won't probably overwrite this.

Removed this job.

[kotharironak]

Looks like most of the labels mentioned in groupBy are ignored?
What does ignoreLabels mean? and ignoreCommitsWith also? As commit with chore is included in group by as Minor fixes.

[JBAhire]

Yes. We don't need ignoreCommits explicitly but we need ignoreLabels to format output of notes. else it will look like this:

[kotharironak]

This will not be used, right?

[kotharironak]

@JBAhire
We need to roll out this change for at least to all the repos whose charts are included here - https://github.com/hypertrace/hypertrace/blob/main/kubernetes/*/Chart.yaml
Can you create checkboxes in the release notes ticket?

Do you think, we should update our PULL request template to indicate a checkbox for adding labels to PR?