Promote date should be in the release note pages

[tas50]

General details

Link to page and section that needs updated:

https://docs.chef.io/release_notes_server/?v=14.8.7

Product

[ ] Chef Automate
[ ] Chef Habitat
[ ] Chef Infra Client
[ ] Chef Infra Server
[ ] Chef InSpec
[ ] All

Describe the update that needs to be made. Be as specific as possible:

Customers need to be able to tell when a product was released from the release notes. This information needs to be included in these pages.

[IanMadd]

From what I've found, the only source of release dates would be in the GitHub repos. We could generate a JSON file for each repo by looping through the API and get a list of dates by tag:

For example, first here: https://api.github.com/repos/chef/chef/tags
Then here: https://api.github.com/repos/chef/chef/commits/a90cddca0af69895415cb34051b15966a9b28277

Then find a way to update this list at each future release with Expeditor. With that list we can add dates to the release notes pages.

[tas50]

A better solution would probably be to extend omnitruck with information on the publish date. That information is most likely available in artifactory.