Failed to generate a docker image

[ddompe]

Issue description

I'm trying to generate a docker image to run Eris from a container, but docker fails with invalid reference format when running docker load

Steps to reproduce

$ nix-build  -Q release.nix -A docker
$ docker load < result
..
fb4f86d9d4c0: Loading layer [==================================================>]  921.6kB/921.6kB
invalid reference format

Technical details

$ printf ' - eris revision: ' && echo $(git rev-parse HEAD) && nix run nixpkgs.nix-info -c nix-info -m
 - eris revision: 0e321f3d2d44f96712768d54e89088b46ad1693a
error: unrecognised flag '-c'
Try 'nix --help' for more information.

$ docker --version
Docker version 20.10.18, build b40c2f6

[ddompe]

Fixed by commenting the line:

tag = eris.version;

Look like the computed version is an invalid string for docker