[BugFix] Doc built cmake error

[vmoens]

Description

Fixes the error appearing at the end of the doc builts:

      error: [Errno 2] No such file or directory: 'cmake'
      [end of output]

[codecov]

Codecov Report

Merging #780 (4ca0260) into main (5c4ec83) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #780   +/-   ##
=======================================
  Coverage   88.76%   88.77%           
=======================================
  Files         123      123           
  Lines       21019    21019           
=======================================
+ Hits        18657    18659    +2     
+ Misses       2362     2360    -2     

Flag	Coverage Δ
habitat-gpu	24.84% <ø> (ø)
linux-brax	29.46% <ø> (ø)
linux-cpu	85.29% <ø> (ø)
linux-gpu	86.21% <ø> (ø)
linux-jumanji	30.24% <ø> (ø)
linux-outdeps-gpu	72.13% <ø> (ø)
linux-stable-cpu	85.15% <ø> (ø)
linux-stable-gpu	85.85% <ø> (+0.01%)	⬆️
linux_examples-gpu	42.84% <ø> (ø)
macos-cpu	85.05% <ø> (+<0.01%)	⬆️
olddeps-gpu	76.02% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
test/test_trainer.py	98.55% <0.00%> (+0.32%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more