Separate codecheck test environment from doc build test environment

[gizmoguy]

fixes #4012
replaces #4008

[codecov]

Codecov Report

Merging #4048 (44a4125) into master (7574aa3) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4048      +/-   ##
==========================================
- Coverage   92.29%   92.26%   -0.03%     
==========================================
  Files          47       47              
  Lines        8896     8909      +13     
==========================================
+ Hits         8210     8219       +9     
- Misses        686      690       +4     

Impacted Files	Coverage Δ
faucet/valve_acl.py	88.37% <0.00%> (-1.21%)	⬇️
faucet/gauge_pollers.py	92.25% <0.00%> (-0.16%)	⬇️
faucet/conf.py	97.96% <0.00%> (-0.01%)	⬇️
faucet/dp.py	96.66% <0.00%> (+0.16%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7574aa3...44a4125. Read the comment docs.