Dev container does not work on ARM based machine

[dwhiteddsoft]

When starting the devcontainer on a MacBook Pro M1 machine, the devcontainer fails. The problem is that tarpaulin does not work with ARM based machines. From the tarpaulin repo:

On Linux Tarpaulin's default tracing backend is still Ptrace and will only work on x86_64 processors. This can be changed to the llvm coverage instrumentation with --engine llvm, for Mac and Windows this is the default collection method.

Can we remove the last line in the Dockerfile and add documentation that if you wanted to test code coverage, you need to install that tool due to platform difference?

Expected Behavior

devcontainer should start on ARM machine

Current Behavior

devcontainer fails to start because it will not build

Steps to Reproduce

1. Get an ARM based laptop
2. Start devcontainer

cc: @juliays

[bastbu]

Thanks for reporting this! The issue was reported to Tarpaulin and an (unreleased) fix is on their development branch, details can be found in the description of #38.

#38 applies your suggestion, we can revert this when Tarpaulin's fix is released.