docker-based build environments for static (linux x86_64) binaries

./build base-*
./build ...

todo:

• better final binary naming (add gcc and glibc version)
• automated basic build + test in CI before i upgrade the bases
  • probably want to upload bases to docker hub and pin versions
• work towards more reproducible builds
  • building static libjpeg ourselves, for example
  • or, find a way to pin debian package versions