Fix path issue for 4C container

Author: davidrudlstorfer

.github/actions/run_tests/action.yml

@@ -29,7 +29,7 @@ runs:
         pip install ${{ inputs.install-command }}
         python --version
         pip list
-        TEMP_DIR="${{ runner.temp }}/meshpy_pytest"
+        TEMP_DIR="${RUNNER_TEMP}/meshpy_pytest"
         mkdir -p "$TEMP_DIR"
         echo "PYTEST_TMPDIR=$TEMP_DIR" >> $GITHUB_ENV
         pytest  --basetemp="$TEMP_DIR" ${{ inputs.additional-pytest-flags}}