Use Node 22 to build frontend (instead of 18)

[jake-low]

See maproulette/maproulette3#2656

[CollinBeczak]

Actually i did have a question about the 22-bullseye

[CollinBeczak]

You switched from bullseye to alpine in the maproulette3 repo, was curious if you remember why: https://github.com/maproulette/maproulette3/blob/784dc3081fe698f64520e10703969bc040989884/Dockerfile#L1

[jake-low]

I tend to use Alpine as a base image for Dockerfiles I write because it's more minimal. Bullseye (Debian 11) is 50MB, while Alpine is <4MB. Apart from that there isn't much reason to prefer one over the other. However they use different package managers (Debian uses apt, Alpine uses apk) so switching this Dockerfile to use Alpine would also require changing the syntax of some of the later RUN commands.

Note that Bullseye is only being used for the builder image here; both Dockerfiles use an Alpine-based nginx image at runtime. So the difference really only affects how long it takes to pull the base image at build time (and hence affects how long CI runs take).

[CollinBeczak]

ok cool, yeah this pr LGTM