Add backport workflow

[acroca]

Brings https://github.com/dapr/dapr/blob/master/.github/workflows/backport.yaml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.62%. Comparing base (9743c6a) to head (74ee8ac).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #813   +/-   ##
=======================================
  Coverage   54.62%   54.62%           
=======================================
  Files          51       51           
  Lines        3469     3469           
=======================================
  Hits         1895     1895           
  Misses       1434     1434           
  Partials      140      140           

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[mikeee]

Just a thought, do we need to be using the DAPR_BOT_TOKEN for this or can we use the standard actions workflow secret?

[acroca]

it needs to be the dapr_bot due to a security measure in github where PRs created from workflows don't trigger other actions, meaning the backport PR wouldn't have CI checks.

[mikeee]

Ah right yes

[mikeee]

I'm fine with the bot token for now but workflows should probably be using the finegrained repo token later