Update validation-tests.yml

Author: Mionsz

.github/workflows/validation-tests.yml

@@ -115,7 +115,7 @@ jobs:
         working-directory: tests/validation
         run: |
           source "$(python3 -m pipenv --venv)/bin/activate"
-          sudo pytest '${{ inputs.validation-tests }}' --nic="${TEST_PORT_P},${TEST_PORT_R}" --media=/mnt/media --build='../..'
+          sudo --preserve-env python3 -m pipenv run pytest '${{ inputs.validation-tests }}' --nic="${TEST_PORT_P},${TEST_PORT_R}" --media=/mnt/media --build='../..'
 
   validation-cleanup-tests:
     needs: [validation-build-mtl, validation-run-tests]