The pull request pipeline does not correctly pull image with changes

[SFJohnson24]

see: #221
The most recent build for this PR includes code to change the control bar in the top left bright red which does not occur.

The workflow yaml file needs to be changed so as to check ref: ${{ github.event.pull_request.head.ref }} after the uses: actions/checkout@v2 stanza when a pull request triggers a build. Some logic will need to be added as this action triggers for PR's to main and pushes so it needs to not do the ref check when it is a push. See: actions/checkout#439

[SFJohnson24]

I have spoken with Azure Support -- our preview environment for pull requests is not functioning properly when we make pull requests. It is building and displaying a link to main without any of the changes from the PR. I am working with support to resolve the issue