The monitoring server still needs to be enabled using prometheus.enable,
so including this in the default build does not add an additional http
server unless the user opts in.
As of go version 1.15.x, the darwin-386 architecture is no longer
supported. Because we use that go version on Travis to assert all
architectures can be built successfully, we have to remove this
architecture from the list.
Because this script is now run from the main Makefile, it is more
suitable to be located in the main scripts folder where the other
build related scripts reside.
