Missing MakeFile build-plugin, and build-plugin bash script

[threadcrux]

Build-plugin associated build files are missing

.PHONY: build-plugin
build-plugin:  ## Build ingress-nginx krew plugin.
        @build/run-in-docker.sh \
                PKG=$(PKG) \
                ARCH=$(ARCH) \
                COMMIT_SHA=$(COMMIT_SHA) \
                REPO_INFO=$(REPO_INFO) \
                TAG=$(TAG) \
                GOBUILD_FLAGS=$(GOBUILD_FLAGS) \
                build/build-plugin.sh

Originally in the sourcecode way back here https://github.com/kubernetes/ingress-nginx/blob/controller-v0.35.0/Makefile#L89

Also the build-plugin.sh build script here:

https://github.com/kubernetes/ingress-nginx/blob/controller-v0.35.0/build/build-plugin.sh

Related to this issue: #12226

[k8s-ci-robot]

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[threadcrux]

Related:
#8812
#7627

This is where it was removed and it looks like nothing has happened since. Why was the Makefile and Build scripts removed? Automated build systems should utilize Makefiles and build scripts not post-exempt them.