[Enhancement] Cache VideoJS dependencies for docker to reduce build times

[syeopite]

Is your enhancement request related to a problem? Please describe.

The Checking player dependencies part of compiling Invidious takes a huge amount of time on docker builds.

Describe the solution you'd like

The VideoJS dependencies should be cached to mitigate this problem. Although I'm not sure if the lengthy part comes from compiling the VideoJS dependency fetch script itself or from the actual fetching of the dependencies themselves from NPM.

This should be investigated

Describe alternatives you've considered

Additional context

[SamantazFox]

Yes, I was thinking about making that its own step in the makefile. That would also allow creating release tarballs (requested in #4672)

[syeopite]

Something like this? https://github.com/iv-org/invidious/pull/4300