Move the Helm plugin installation from the Makefile to the Git hook.

Same as the Vagrant plugins, this is really inside the home directory
and not globally installable (like the other binaries in the Makefile).

.githooks/post-merge

@@ -29,3 +29,9 @@ then
         vagrant plugin list | grep -qw "$plugin" || vagrant plugin install "$plugin" || true
     done
 fi
+if command -v helm > /dev/null
+then
+    echo Installing Hem plugins >&2
+    helm plugin remove diff
+    helm plugin install https://github.com/databus23/helm-diff --version master
+fi

Makefile

@@ -13,7 +13,7 @@ ansible-local = ansible localhost -c local -i localhost, -e "ansible_python_inte
 all: binaries vendored generated
 vendored: .config/pythonrc.py .bash_completion.d/aws .bash_completion.d/docker-compose .bash_completion.d/docker-machine.bash .bash_completion.d/docker-machine.bash .travis/travis.sh .bash_completion.d/molecule Documents/bin/rabbitmqadmin .bash_completion.d/toolbox
 generated: .ssh/config .bash_completion.d/helm .bash_completion.d/kops .bash_completion.d/kubectl .bash_completion.d/kompose .bash_completion.d/minikube .bash_completion.d/pipenv .bash_completion.d/pandoc .bash_completion.d/skaffold .bash_completion.d/rabbitmqadmin .ssh/localhost .ssh/localhost.pub .ssh/authorized_keys .bash_completion.d/minishift .bash_completion.d/oc .bash_completion.d/poetry
-binaries: $(DESTDIR)/share/bfg/bfg.jar $(DESTDIR)/bin/rke $(DESTDIR)/bin/docker-machine $(DESTDIR)/bin/packer $(DESTDIR)/bin/terraform $(DESTDIR)/bin/vault $(DESTDIR)/bin/kubectl $(DESTDIR)/bin/kops $(DESTDIR)/bin/kompose $(DESTDIR)/bin/minikube $(DESTDIR)/bin/docker-machine-driver-kvm2 $(DESTDIR)/bin/kustomize $(DESTDIR)/bin/pack $(DESTDIR)/bin/skaffold $(DESTDIR)/bin/minishift $(DESTDIR)/bin/oc $(DESTDIR)/bin/docker-machine-driver-kvm $(HELM_HOME)/plugins/helm-diff/bin/diff $(DESTDIR)/bin/gomplate $(DESTDIR)/bin/envconsul
+binaries: $(DESTDIR)/share/bfg/bfg.jar $(DESTDIR)/bin/rke $(DESTDIR)/bin/docker-machine $(DESTDIR)/bin/packer $(DESTDIR)/bin/terraform $(DESTDIR)/bin/vault $(DESTDIR)/bin/kubectl $(DESTDIR)/bin/kops $(DESTDIR)/bin/kompose $(DESTDIR)/bin/minikube $(DESTDIR)/bin/docker-machine-driver-kvm2 $(DESTDIR)/bin/kustomize $(DESTDIR)/bin/pack $(DESTDIR)/bin/skaffold $(DESTDIR)/bin/minishift $(DESTDIR)/bin/oc $(DESTDIR)/bin/docker-machine-driver-kvm $(DESTDIR)/bin/gomplate $(DESTDIR)/bin/envconsul
 
 
 ## Binary files
@@ -116,11 +116,6 @@ $(DESTDIR)/bin/docker-machine-driver-kvm:
 	-$(download) https://github.com/dhiltgen/docker-machine-kvm/releases/download/v0.10.0/docker-machine-driver-kvm-ubuntu16.04
 	-chmod +x $@
 
-$(HELM_HOME)/plugins/helm-diff/bin/diff: $(DESTDIR)/bin/helm
-	mkdir -p $(HELM_HOME)/plugins
-	-helm plugin remove diff
-	-$(DESTDIR)/bin/helm plugin install https://github.com/databus23/helm-diff --version master
-
 $(DESTDIR)/bin/gomplate:
 	mkdir -p $$(dirname $@)
 	-$(download) https://github.com/hairyhenderson/gomplate/releases/download/v3.5.0/gomplate_$(goos)-$(goarch)