only rebuild docs from main

[aagbsn]

I noticed that docs.ooni.org is getting redeployed from any push to this repo; probably not what we want?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.10%. Comparing base (07e13bd) to head (1576b9f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
+ Coverage   83.07%   83.10%   +0.03%     
==========================================
  Files          91       91              
  Lines        6411     6411              
==========================================
+ Hits         5326     5328       +2     
+ Misses       1085     1083       -2     

Flag	Coverage Δ
oonidata	77.87% <ø> (ø)
oonipipeline	85.37% <ø> (+0.04%)	⬆️

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[hellais]

LGTM