Update julia_ci.yml to run docs on PR and push

[jpfairbanks]

Trying to fix #148

[lukem12345]

See @quffaro ,s branch for situational awareness https://github.com/AlgebraicJulia/ACSets.jl/tree/cm/buildkite

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.97%. Comparing base (4ba78ca) to head (013cfad).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   92.02%   91.97%   -0.05%     
==========================================
  Files          23       23              
  Lines        2118     2118              
==========================================
- Hits         1949     1948       -1     
- Misses        169      170       +1     

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