BuildBuddy RBE from devcontainer

[mvgijssel]

From BuildBuddy slack https://buildbuddy.slack.com/archives/CUY16GNK1/p1681908740387489?thread_ts=1681908445.883089&channel=CUY16GNK1&message_ts=1681908740.387489:

For our repo, we often use the following set of flags to cross-compile remotely from MacOS M1 to Linux AMD64
bazel test //...
--remote_executor=remote.buildbuddy.io
--host_cpu=k8
--cpu=k8
--crosstool_top=@buildbuddy_toolchain//:ubuntu_cc_toolchain_suite
--host_platform=@buildbuddy_toolchain//:platform_linux
--extra_toolchains=@buildbuddy_toolchain//:ubuntu_cc_toolchain
--jobs=100

However you need to declare separate Go SDK to have a linux Go sdk available
https://github.com/buildbuddy-io/buildbuddy/blob/73ec4544d3bf813141314970275d4c2eaa5091a8/WORKSPACE#L57-L83

I raised bazel-contrib/rules_go#3540 few mins ago in hope to improve this experience further.