Support for docker

[topongo]

add Dockerfile for containerization, so that we can avoiding clogging our systems with enormous latex packages.
uses two containers: rust for building and archlinux for running (with latex dependencies installed).
default entrypoint is the watcher wrapper /usr/bin/curriculust-watch (slightly modified version of build.sh) but can be changed to the pure version (/usr/bin/curriculust: the binary from cargo) using --entrypoint /usr/bin/curriculust when invoking docker run

[Stypox]

Nice! Could you also add a "Dockerfile usage" section in the README (before "build.sh usage"), with the info you provided here?

[topongo]

i'm having some problems with the build.sh script, I don't think is meant to be very reliable, or at least is very specific in his behavior and it doens't adapt well to the docker usage: it has a lot of edge cases that makes it unresponsive to modifications or too responsive, and in some cases even inconsistent in its output. i ain't blaming no one for this, but i should rewrite it from scratch before merge or giving a big unstable disclaimer for docker.