Update controller-gen tool from sigs.k8s.io/controller-tools to the
latest release.
Also, bump goimports from golang.org/x/tools to the latest version.
Also, don't pre-install all k8s code-generator tools in the image. The
generate-groups.sh of code-generator will do "go install" for the tools
it needs which fails with permission denied error in some environments
as it tries to overwrite the existing files owned by root.
Use the same base image (golang) for auto-generation as for building
container images. This makes sure that we stay in sync in terms of the
golang version used.
Run code auto-generation inside a container instead of the host system.
Our auto-generation depends on specific versions of a multitude of tools
(like k8s code-generator, controller-gen, protoc, mockery etc). This
made it really awkward (and error-prone) to run in the host environment,
especially if/when you needed different versions of those tools for
other projects. Making it even more unwieldy, the required versions of
tools were not neatly documented anywhere (except for git commits,
perhaps).
With this patch we have a "fixed environment", as we build a special
auto-generate-builder container which has correct versions of all the
dependencies. Using the container makes auto-generation easy to run
anywhere, independent of the host system, giving reproducibility and
reliability. Also, the patch moves the auto-generation steps out from
the makefile into a separate script, making the makefile cleaner and the
script easier to maintain.
