Exclude OpenGL files from doctests

Author: eulertour

.github/workflows/ci.yml

@@ -118,7 +118,7 @@ jobs:
         run: xvfb-run -s "-screen 0 1400x900x24" poetry run pytest
 
       - name: Run module doctests
-        run: poetry run pytest --doctest-modules manim
+        run: poetry run pytest --doctest-modules --ignore-glob="*opengl*" manim
 
       - name: Run doctests in rst files
         run: cd docs && pip install -r requirements.txt && poetry run make doctest O=-tskip-manim