Mechanism to alert users to regarding version or security updates

[yannickwurm]

One low-key mechanism:

• host empty text file: https://sequenceserver.com/alerts/2-1.html
  • Each new release loads a new version of the alert.html file to ensure only relevant alerts are shown.
• this is loaded asynchronously (iframe? Or js?) at top of of layout.erb (but under the header). So it shouldn't block loading or affect load time.
• When new version is released, we change the text file to have blue info field - and include text about update.

But would there be a cross-origin hosting issue?

Alternative?