ci: run javascript unit tests on Jenkins (#75133)

setup-node.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+
+pip install nodeenv
+nodeenv --python-virtualenv --prebuilt
+npm clean-install
+pip install $*

tox.ini

@@ -1,12 +1,15 @@
 [tox]
-envlist = codestyle-pylint
+envlist = codestyle-pylint, jest
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/gadjo/{env:BRANCH_NAME:}
 
 [testenv]
+whitelist_externals = bash
 deps =
   codestyle: pre-commit
   pylint: pylint
   pylint: pylint-django
+install_command =
+  jest: bash setup-node.sh {opts} {packages}
 commands =
   codestyle: pre-commit run --all-files --show-diff-on-failure
-  pylint: ./pylint.sh gadjo/
+  jest: npx jest