feat: document release process

Documented the release process for building and pushing the container
image to the image registry.

Author: sudomateo

Makefile

@@ -9,7 +9,7 @@ endif
 GIT_COMMIT_SHORT := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
 
 # Container image configuration.
-IMAGE_REGISTRY ?= ghcr.io/oxidecomputer
+IMAGE_REGISTRY ?= localhost
 IMAGE_NAME ?= oxide-cloud-controller-manager
 IMAGE_TAG ?= $(patsubst v%,%,$(VERSION))-$(GIT_COMMIT_SHORT)
 IMAGE_FULL ?= $(if $(IMAGE_REGISTRY),$(IMAGE_REGISTRY)/)$(IMAGE_NAME):$(IMAGE_TAG)
@@ -21,7 +21,7 @@ test:
 		--build-arg GO_CONTAINER_IMAGE=$(GO_CONTAINER_IMAGE) \
 		--build-arg VERSION=$(VERSION) \
 		--target builder \
-		-t $(IMAGE_NAME)-builder:$(IMAGE_TAG) \
+		-t $(if $(IMAGE_REGISTRY),$(IMAGE_REGISTRY)/)$(IMAGE_NAME)-builder:$(IMAGE_TAG) \
 		.
 	$(CONTAINER_RUNTIME) run --rm $(IMAGE_NAME)-builder:$(IMAGE_TAG) go test -v ./...
 
@@ -31,6 +31,8 @@ build:
 	$(CONTAINER_RUNTIME) build \
 		--build-arg GO_CONTAINER_IMAGE=$(GO_CONTAINER_IMAGE) \
 		--build-arg VERSION=$(VERSION) \
+		--annotation org.opencontainers.image.description='Oxide Cloud Controller Manager' \
+		--annotation org.opencontainers.image.source=https://github.com/oxidecomputer/oxide-cloud-controller-manager \
 		-t $(IMAGE_FULL) \
 		.
 

README.adoc

@@ -102,3 +102,23 @@ podman run \
 	--cloud-provider oxide \
 	--kubeconfig /tmp/kubeconfig.yaml
 ----
+
+== Release Process
+
+The release process is manual and runs from a developer's workstation for now.
+
+. Check out the revision to be released. Ensure the working copy is clean.
+
+. Build the container image using the correct image registry and tag.
++
+[source,shell]
+----
+IMAGE_REGISTRY=ghcr.io/oxidecomputer IMAGE_TAG=0.1.0 make build
+----
+
+. Push the container image using to correct image registry.
++
+[source,shell]
+----
+IMAGE_REGISTRY=ghcr.io/oxidecomputer IMAGE_TAG=0.1.0 make push
+----