Set LIBGL_ALWAYS_SOFTWARE env variable in doc build #2546

Job	Run time
Documentation style	19s
Build wheelhouse (ubuntu-latest, 3.10, false)	32s
Pre-commit Check	2m 40s
Build wheelhouse (ubuntu-latest, 3.11, false)	29s
Check library vulnerabilities	39s
Build wheelhouse (ubuntu-latest, 3.12, false)	38s
Build Documentation (quick)	1m 14s
Build wheelhouse (windows-latest, 3.10, false)	2m 12s
Build Documentation (full)	13m 45s
Test documentation snippets	3m 25s
Build wheelhouse (windows-latest, 3.11, false)	1m 15s
Build wheelhouse (windows-latest, 3.12, false)	1m 26s
Testing with direct launch mode	2m 22s
Testing (3.10, latest)	3m 2s
Testing with minimum dependencies (3.10, latest)	2m 7s
Testing (3.11, latest)	2m 46s
Testing with minimum dependencies (3.11, latest)	2m 0s
Testing (3.12, latest)	6m 24s
Testing with minimum dependencies (3.12, latest)	2m 5s
Testing (3.12, 2024R2)	2m 42s
Testing (3.12, 2025R1)	2m 49s
Testing (3.12, 2025R2)	2m 47s
Build library	20s
Release project	0s
Upload dev documentation	0s
Upload release documentation	0s
	57m 58s

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