Put the version of synapse_admin in manifest.json

[azmeuk]

manifest.json supports version numbers.
I could use that information, so monitoring tools could check the synapse-admin version installed on my servers and update them when needed.
What do you think about adding the synapse-admin version in the manifest.json file?

[awesome-manuel]

Good idea. We plan to switch to vite.js and use vite-plugin-version-mark to get the correct version from git. Maybe vite-plugin-pwa can be used to generate the manifest.json.