add version meta tag

[niquerio]

Adds version meta tag. This will expose the version of the site so you can verify which image is running without checking kubernetes or argocd.

This changes makes it so that the application exposes the value in the environment variable APP_VERSION through the version meta tag. In development this is always APP_VERSION. In kubernetes, this is inserted at kubernetes application time, and is the tag of the app image. The tag is either the release version (in production for stable images) or the commit hash (in not-production for unstable images).

The development version doesn't try to calculate the version because it'd be somewhat complex logic relying on git cli commands, and it's not the right place for this logic in the first place. We want to insert the image information and that information comes from outside of the application. So, when viewing the site on localhost, the version will always show APP_VERSION, and it is supposed to do that.

[erinesullivan]

👍🏻 I see the meta tag.