Improve and document the developer deployment process. (argoproj#37)

Rather than require developers to change on disk files in the git index,
or create custom patching solutions, introduce a make target that allows
us to build, push, and deploy manifests in a single command.

Makefile

@@ -1,6 +1,5 @@
 VERSION?=$(shell cat VERSION)
-IMAGE_TAG?=v$(VERSION)
-IMAGE_PREFIX?=argoprojlabs
+IMAGE?=argoprojlabs/argocd-applicationset:v$(VERSION)
 DOCKER_PUSH?=true
 
 .PHONY: build
@@ -9,8 +8,13 @@ build:
 
 .PHONY: image
 image:
-	docker build -t $(IMAGE_PREFIX)/argocd-applicationset:$(IMAGE_TAG) .
-	@if [ "$(DOCKER_PUSH)" = "true" ] ; then docker push $(IMAGE_PREFIX)/argocd-applicationset:$(IMAGE_TAG) ; fi
+	docker build -t $(IMAGE) .
+	@if [ "$(DOCKER_PUSH)" = "true" ] ; then docker push $(IMAGE) ; fi
+
+.PHONY: deploy
+deploy:
+	kustomize build manifests/cluster-install | kubectl apply -f -
+	kubectl patch deployment -n argocd argocd-applicationset-controller --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/0/image", "value": "$(IMAGE)"}]'
 
 # Generate manifests e.g. CRD, RBAC etc.
 .PHONY: manifests

README.md

@@ -12,6 +12,22 @@ compatibility are made, at least until merging into Argo CD proper.
 ## Proposal:
 * https://docs.google.com/document/d/1juWGr20FQaJmuuTIS8mBFmWWDU422M_FQMuhp5c1jt4/edit?usp=sharing
 
+## Development Instructions
+
+The following assumes you have: 
+
+ 1. Installed a recent version of [kustomize](https://github.com/kubernetes-sigs/kustomize) (3.x+). 
+ 1. Created a container repository for your development image.
+ 1. Deployed ArgoCD into the "argocd" namespace.
+
+To build and push a container with your current code, and deploy Kubernetes manifests for the controller Deployment:
+
+```bash
+IMAGE="username/argocd-applicationset:v0.0.1" make image deploy
+```
+
+The ApplicationSet controller should now be running in the "argocd" namespace.
+
 ## Example Spec:
 
 ```yaml
@@ -40,3 +56,4 @@ spec:
 ```
 
 Additional examples are available in the [examples](./examples) directory.
+