Feature flag service build fails on Mac M1

[mviitane]

Bug Report

Which version of the demo you are using?
Using main/latest

Symptom

Starting with a clean system
$ docker system prune -a

Build fails:

$ docker compose build featureflagservice
…
 => ERROR [builder 20/25] RUN ~/.mix/rebar3 grpc_regen                                                                                                                                                                                                      0.3s
------
 > [builder 20/25] RUN ~/.mix/rebar3 grpc_regen:
#0 0.236 escript: exception error: undefined function rebar3:main/1
#0 0.236   in function  escript:run/2 (escript.erl, line 758)
#0 0.236   in call from escript:start/1 (escript.erl, line 277)
#0 0.236   in call from init:start_em/1 
#0 0.236   in call from init:do_boot/3 
------
failed to solve: executor failed running [/bin/sh -c ~/.mix/rebar3 grpc_regen]: exit code: 127

[tsloughter]

Is there anything cached? That error usually means the rebar3 is built for an incompatible version of Erlang.

[mviitane]

I tried to clean my docker env with the prune command beforehand, but it didn't help. Also got a confirmation @cedricziel saw the same problem.

[tsloughter]

I can confirm it fails for me too the same way and I'm not on a Mac. So this is unrelated to the arch.

[tsloughter]

Oooooh, I know what it is.

We released rebar3 3.21.0 last week and it is built for OTP-26 (we only support the last 3 versions of OTP, so 23 which this Dockerfile uses is no longer supported -- well it technically works, but not with the prebuilt binary that the Dockerfile downloads).

[mviitane]

This got fixed with #903