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Implement cache-busting tags

Maxime Besson requested to merge fix-js-tag-1921 into v2.0

See #1921 (closed) I have implemented a query parameter that forces web browser to reload cache of static assets. This technique is called cache busting.

As a result, our static URLs now look like: image

The tag is computed from:

  • Lemonldap version
  • key
  • optional salt (cacheTagSalt config parameter)

which means it has the following properties:

  • the tag changes when the LLNG version changes, which means updated js/css are immediately used by web browsers
  • the LLNG version cannot be easily deduced from the tag
  • Admins may modify the salt to manually change the tag when they modify static files without upgrading LLNG
Edited by Maxime Besson

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