Our current build downloads the amd64 elm binary and runs it in an arm container. This works on GitHub due to it being an emulated environment, but on a native arm device fails with:

ERROR in ./src/Main.elm
Module build failed (from ./node_modules/elm-webpack-loader/index.js):
Compiler process exited with error Error attempting to run Elm compiler "elm":
Error: spawn Unknown system error -8

Marking the frontend build as amd64 will cause it to execute much faster on GitHub, and resolve issues migrating from webpack to parcel (#260), which is very picky about it's arm environment. Our Dockerfile will continue to fail on native arm devices, but they will still be able to pull our prebuilt images.