Deploy playground to GitHub Pages

[antvaset]

• Add CI job that deploys the CQL playground to cqframework.github.io/clinical_quality_language/playground (gh-pages branch) when code is pushed to the master branch

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.70%. Comparing base (d792a4a) to head (489ea22).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1626   +/-   ##
=========================================
  Coverage     65.70%   65.70%           
  Complexity     1646     1646           
=========================================
  Files           470      470           
  Lines         27989    27989           
  Branches       5429     5429           
=========================================
  Hits          18391    18391           
  Misses         7309     7309           
  Partials       2289     2289           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud