Check for standard requirements workflow

[rmbielby]

Describe the solution you'd like

We could do with a workflow script that ensures a public dashboard is meeting the necessary requirements (as much as we can reasonably regulate via a workflow). I'm thinking:

• ensure the necessary cookie control elements are present
• ensure an accessibility statement is present
• ensure the support_links panel is present

In addition, it might be worth considering if certain parameters are filled in appropriately (although I suspect we'll have plenty of these covered just by mandating the above panels are present and their associated validation):

• google_analytics_key
• title
• name of dashboard in cookies
• ...

Describe alternatives you've considered

Thought about a commit hook, but I like it the idea of something being added to the PR testing so that we've got clearer sight of what's going on.

Additional context

This follows on from the Attendance dashboard team removing the necessary cookie control code from their server.R script and breaking that functionality for 3 weeks.

[cjrace]

I like this, would be interesting to think about whether there's anything we do to automate monitoring as a GitHub organisation when this workflow is run and whether its last run on the default branch of a given repo passed or failed.