add /usr/bin to PYTHONPATH

Author: patapenka-alexey

.github/workflows/packing.yml

@@ -555,12 +555,10 @@ jobs:
 
       - name: Run tests
         run: |
-          apt install --reinstall python3
-          python3 -c "import runpy; print('runpy module is available')"
-          . .venv/bin/activate
           apt install -y `pwd`/deb_dist/python3-tarantool_*.deb
           ls -la /usr/lib/python3/dist-packages/tarantool
-          export PYTHONPATH=$PYTHONPATH:/usr/lib/python3/dist-packages/tarantool:/usr/lib/python3/dist-packages/tarantool/
+          . .venv/bin/activate
+          export PYTHONPATH=$PYTHONPATH:/usr/bin:/usr/lib/python3/dist-packages/tarantool
           echo $PYTHONPATH
           make test-pure-install
         if: matrix.target.dist == 'bookworm' || matrix.target.dist == 'noble'