migrate to victoria testing runtime

As per victoria cycle testing runtime and community goal[1]
we need to migrate upstream CI/CD to Ubuntu Focal(20.04)
and Node.js 10.

Tox is not anymore pre-installed on the OpenDev CI images.
The file package.json needs tox, install it to fix the nodejs-job.

Install it via a pre-run playbook so that this is run in addition to all
of the playbooks of the parent.

This patch also update python version to py38 in package.json[2]
as py36 is not available on focal.

Note: Before this patch We used nodejs8-jobs from openstack-zuul-jobs
which consumes npm jobs from zuul-jobs. We would like to install tox
in the 'pre-run' phase in each npm job, so this patch also defines
npm job defination here.

Story: #2007865
Task: #40212

[1] https://governance.openstack.org/tc/goals/selected/victoria/migrate-ci-cd-jobs-to-ubuntu-focal.html
[2] https://opendev.org/openstack/stackviz/src/branch/master/package.json#L73

Co-Author: manchandavishal <manchandavishal143@gmail.com>

Change-Id: I116ea1609f88496c599a8285d33350104067c517

.zuul.yaml

@@ -1,3 +1,25 @@
+- job:
+    name: stackviz-nodejs10-run-lint
+    parent: nodejs-run-lint
+    description: |
+      Run lint using Node 10.
+    vars:
+      node_version: 10
+    nodeset: ubuntu-focal
+    pre-run: playbooks/nodejs/pre.yaml
+    required-projects:
+      - openstack/stackviz
+
+- job:
+    name: stackviz-nodejs10-run-test-browser
+    parent: nodejs-run-test-browser
+    vars:
+      node_version: 10
+    nodeset: ubuntu-focal
+    pre-run: playbooks/nodejs/pre.yaml
+    required-projects:
+      - openstack/stackviz
+
 - job:
     name: tempest-full-rocky
     parent: tempest-full-py3
@@ -6,12 +28,13 @@
 
 - project:
     templates:
-      - nodejs8-jobs
       - publish-openstack-docs-pti
       - openstack-python35-jobs
       - openstack-python3-victoria-jobs
     check:
       jobs:
+      - stackviz-nodejs10-run-lint
+      - stackviz-nodejs10-run-test-browser
       - tempest-full-py3:
           irrelevant-files: &irrelevant-files
             - ^.*\.rst$
@@ -27,6 +50,11 @@
           irrelevant-files: *irrelevant-files
       - tempest-full-rocky:
           irrelevant-files: *irrelevant-files
+    gate:
+      jobs:
+      - stackviz-nodejs10-run-lint
+      - stackviz-nodejs10-run-test-browser
+
     post:
       jobs:
         - publish-openstack-stackviz-element

package.json

@@ -70,7 +70,7 @@
     "watchify": "3.7.0"
   },
   "scripts": {
-    "postinstall": "if [ ! -d .venv ]; then tox -epy36 --notest; fi",
+    "postinstall": "if [ ! -d .venv ]; then tox -epy38 --notest; fi",
     "test": "gulp unit",
     "lint": "eslint ./",
     "prod": "gulp prod; python setup.py sdist"

playbooks/nodejs/pre.yaml

@@ -0,0 +1,6 @@
+- hosts: all
+  roles:
+    # package.json needs to run 'tox' as command, ensure that it's
+    # installed and can be used globally.
+    - role: ensure-tox
+      ensure_global_symlinks: True