Use pytest from venv

Author: Tigul

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
         sudo apt-get update
         cd /opt/ros/overlay_ws/src/semantic_world
         source ../semantic_world-venv/bin/activate    
-        pip install -U pip && pip install -r requirements.txt && pip install . && pip install -r doc/requirements.txt
+        pip install -U pip && pip install -r requirements.txt && pip install . && pip install pytest
         echo "PATH=$PWD/ultiverse-Parser/ext/blender:$PWD/ultiverse-Parser/USD/linux/lib/python:$PWD/ultiverse-Parser/USD/linux/plugin/usd:$PATH" >> $GITHUB_ENV
         echo "PYTHONPATH=$PWD/ultiverse-Parser/USD/linux/lib/python:$PWD/src" >> $GITHUB_ENV
 
@@ -44,4 +44,4 @@ jobs:
       run: |
         cd /opt/ros/overlay_ws/src/semantic_world
         source ../semantic_world-venv/bin/activate 
-        pytest -v test/
+        python -m pytest -v test/