Hey, do you by chance have an example repo that reproduces the timeout? From what we can see on our end, the majority of the slow build time is attributed to RUN mix deps.compile, with it using all 8 machine CPUs during that time, though generally it’s taken 20-30 min to process that step and your recent builds from Tuesday seem to have succeeded.
If you are able to make a repo with the same dependencies as your app, I’m happy to profile the compile on my end.