ci: GHA workflow to release image to ghcr.io

.github/workflows/release-image.yaml

@@ -0,0 +1,26 @@
+name: Release
+on:
+  push:
+    tags:
+      - "*-d2iq.test.dev*"
+
+# Because variables are not exported, they are not visible by child processes, e.g. make
+env:
+  registry: ghcr.io/mesosphere
+
+jobs:
+  release:
+    name: Release
+    runs-on:
+      - ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Login to container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.registry }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push container image
+        run: |
+          make release-ghcr

Makefile

@@ -188,6 +188,7 @@ REGISTRY ?= gcr.io/$(shell gcloud config get-value project)
 PROD_REGISTRY ?= registry.k8s.io/cluster-api-vsphere
 
 STAGING_REGISTRY ?= gcr.io/k8s-staging-capi-vsphere
+GHCR_REGISTRY ?= ghcr.io/mesosphere/cluster-api-provider-vsphere
 STAGING_BUCKET ?= artifacts.k8s-staging-capi-vsphere.appspot.com
 
 # core
@@ -605,7 +606,12 @@ generate-flavors: $(FLAVOR_DIR)
 
 .PHONY: release-staging
 release-staging: ## Build and push container images to the staging registry
-	REGISTRY=$(STAGING_REGISTRY) $(MAKE) docker-build-all docker-push-all release-alias-tag
+	REGISTRY=$(STAGING_REGISTRY) TAG=$(RELEASE_TAG) $(MAKE) docker-build-all docker-push-all release-alias-tag
+
+.PHONY: release-ghcr
+release-ghcr: ## Build and push container images to the staging registry
+	REGISTRY=$(GHCR_REGISTRY) $(MAKE) docker-build-all docker-push-all
+
 
 .PHONY: release-alias-tag
 release-alias-tag: ## Add the release alias tag to the last build tag