Don't run as root when building protobuf files

[kommendorkapten]

May close #244

Summary

Make sure that docker does not run as root when building protobuf files.

Release Note

N/A

Documentation

N/A

[kommendorkapten]

This is a quite massive rewrite as getting everything to run as a non-root user isn't trivial. I would appreciate if as many as possible could run

$ make clean
$ make
$ git status

And verify that it all builds correctly and no un-expected modifications happens to the generate files.

[kommendorkapten]

Alpine does not use the "standard" useradd command.

[loosebazooka]

Nice! Works for me.

[haydentherapper]

Testing locally, I had to move lines 14-18, the apt-get for curl and build-essential, above 10-12, or else it failed with E: Failed to fetch http://deb.debian.org/debian/pool/main/p/perl/perl-modules-5.32_5.32.1-4%2bdeb11u2_all.deb 404 Not Found [IP: 151.101.22.132 80] (not sure why). Can we swap the order?

[haydentherapper]

I got an error: adduser: number 561799 is not in 0..256000 range. Looks like https://stackoverflow.com/questions/41807026/cant-add-a-user-with-a-high-uid-in-docker-alpine would be the fix?

[kommendorkapten]

Interesting, I'll try to take a look later this week.

[haydentherapper]

This is awesome, thanks so much for tackling this.

[haydentherapper]

@kommendorkapten, did you get a chance to look into the open comments, or would you like someone to take a look?

[kommendorkapten]

@haydentherapper Last weeks was busy with preparation for KubeCon and so. I'm back now from the Easter break so I would be able to work on this again this week.