Add discord release notification

[guarin]

Changes

• Automatically send message to discord for new releases

The message will look like this and be sent to the general channel:

I tried to keep the action simple and did not add any fancy checks. In some weird scenarios we might get additional or no messages:

• If a release is first released as a pre-release and only later changed to a latest release no notification will be sent
• If a release is released but not marked as the latest release a notification will still be sent

Note that no message will be sent for draft releases, edits, deleted releases, etc.

How was it tested?

Tested it in a test repo and test discord channel.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a5ef7d0) 85.34% compared to head (fea9263) 85.34%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1427   +/-   ##
=======================================
  Coverage   85.34%   85.34%           
=======================================
  Files         130      130           
  Lines        5488     5488           
=======================================
  Hits         4684     4684           
  Misses        804      804           

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[philippmwirth]

Nice 👍