RethinkDB Mass Package Builder

   This repo has tools for building RethinkDB on a crapload of
   platforms.  It uses Docker because that's a way to get operating
   system images and run stuff on them.

   Right now, you could run:

       # Mac
       ruby setup.rb

       # Linux
       sudo ruby setup.rb

   Sudo is only necessary if your docker installation needs it.

   This supports kicking off a mass package build for a given
   rethinkdb git commit.  It also supports kicking off an individual
   package build for a particular (rethinkdb git commit, platform)
   pair.

EXAMPLE USAGE:

    ./setup.rb --help

    # build packages, test installation, and copy packages for jammy
    ./setup.rb -c v2.4.3 --v243support --packages --test-pkgs --copy-pkgs --distro jammy

    # view rethinkdb_2.4.3~0jammy_amd64.deb
    ls artifacts/pkgs

BUILD REQUIREMENTS:

   You need Ruby and Docker.

REPRODUCIBILITY:

   These builds are not perfectly reproducible.  They run "apt-get
   update", for example, and fetch unversioned and un-checksummed
   dependencies from their apt sources.  Sometimes package sources
   disappear, or change URLs, causing the Dockerfiles to break.

DIRECTORY STRUCTURE:

   - rdbcheckout - clones rethinkdb and fetches the biggest external
     dependencies.  We have this here so we don't have to re-clone and
     fetch for every platform (a zillion times over).

     Keeps the checkout in /rdb

   - artifacts - output directory (created by setup.rb) for packages,
     dist files, etc.

   - dist, build - common docker recipes that are identical on most
     of their applicable platforms.

   - bionic, buster, stretch, centos8, et al - dockerfiles for building
     on specific platforms

     Copies /rdb from rdbcheckout to /platform, then does its work.

NOTES:

   - The creator of this (Sam Hughes <sam@samuelhughes.com>) is a
     Docker n00b, so feel free to second-guess his decisions.