Add Clang 15 CI build

[offa]

Adds a CI build for latest Clang 15.

[codecov[bot]]

Codecov Report

Merging #177 (cb2b437) into master (025ff68) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   34.65%   34.65%           
=======================================
  Files          53       53           
  Lines        2323     2323           
  Branches      354      354           
=======================================
  Hits          805      805           
  Misses       1429     1429           
  Partials       89       89           

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