Install pyvisfile for examples CI

.gitlab-ci.yml

@@ -75,7 +75,7 @@ Python 3 POCL Examples:
   - export PY_EXE=python3
   - export PYOPENCL_TEST=portable:pthread
   # cython is here because pytential (for now, for TS) depends on it
-  - export EXTRA_INSTALL="pybind11 cython numpy mako"
+  - export EXTRA_INSTALL="pybind11 cython numpy mako pyvisfile"
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-py-project-and-run-examples.sh
   - ". ./build-py-project-and-run-examples.sh"
   tags: