Add Cache Busting to webpack build

[Ranthalion]

Users may experience problems after upgrading reef-pi since browsers cache static content. This issue can be fixed by using a cache busting scheme during the production webpack build. This should solve the problem of asking users to make sure they clear their cache after upgrade.

[zekth]

@Ranthalion you want to add HASH in the file path?

Also, http server can bust the cache too by using "modified date" to send to the http client

[Ranthalion]

I don't have any implementation in mind. I think HASH is a typical solution, but I have not researched any alternatives.

[zekth]

I don't have any implementation in mind. I think HASH is a typical solution, but I have not researched any alternatives.

We can use HASH for release number / revision. Depends on how you want to implement it. Also http server can handle it too. But in our case the best is hash or revision. I'm taking care of it.

[ranjib]

Cache-control header is another option