Gitaly 18.6.0 breaks compatibility with i386 environment

I saw that in this commit: 5ed4b627

The code expects to have an int64 in all cases, which is not the case for an 32-bit environment. The fix would be simple:

attribute.Int64("maxrss", int64(rusage.Maxrss))

Do you want to fix this code parts or do you want to drop i386 support?

Please let me know, if you want to drop i386 I will mark gitaly as broken for i386 on FreeBSD which is totally fine.