Extend awards action

[Scroogey-SN]

Implements #1849

Adds a github action that is triggered on PR merge events, running a script that finds the relevant PR and associated issue.
It calculates the awards due to the PR and issue authors based on the issue tags and difficulty/priority rules. If needed, it adds lines to awards.csv and opens a PR for this change.

I switched the action trigger to pull_request (instead of push) and added a step 'unfiltered' to echo the event for logging.

Tested with squash and merge.

[huumn]

Failed with this error. Looks like it's reading in something it doesn't intend to.

'{
/home/runner/work/_temp/80dd4180-04a2-4245-8af3-82140e8cffed.sh: line 1: useWalletPayment: command not found
/home/runner/work/_temp/80dd4180-04a2-4245-8af3-82140e8cffed.sh: line 1: AnonWalletError: command not found
Traceback (most recent call last):
  File "/home/runner/work/stacker.news/stacker.news/extend-awards.py", line 106, in <module>
    j = json.loads(sys.argv[1])
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/json/decoder.py", line 345, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.13.2/x64/lib/python3.13/json/decoder.py", line 361, in raw_decode
    obj, end = self.scan_once(s, idx)
               ~~~~~~~~~~~~~~^^^^^^^^
json.decoder.JSONDecodeError: Unterminated string starting at: line 230 column 15 (char 11790)
Error: Process completed with exit code 1.

[Scroogey-SN]

Oh, the backticks in the event body get evaluted by the shell, that's where the useWalletPayment comes from.

It's unsafe passing ${{ github }} on the command line!

I'll change it to pass it through an environment variable instead. And test with various "evil" inputs. Sorry for the trouble.