Update gitlab pipeline with node setup

[jordojordo]

Summary

Fixes #11240

Node.js v14 is incompatible with the latest dashboard build, bumping the package to nodejs16 does not solve the problem of the openssl incompatibility. In order to circumvent this, node.js v16 needs to be installed manually as the original package from https://download.opensuse.org/repositories/devel:languages:nodejs/SLE_12_SP5/devel:languages:nodejs.repo is outdated.

Occurred changes and/or fixed issues

I've added a node-setup script to the pipeline that will download the specified release declared in the NODE_DISTRO variable from the nodejs releases index.

Technical notes summary

The variables stanza now has some variables to alleviate any further issues with upgrading node and yq.

Areas or cases that should be tested

Installing the Extension catalog image that is published to the gitlab container registry of the repository.

Areas which could experience regressions

Screenshot/Video

You can see a passing test of this pipeline here.

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[aalves08]

LGTM