Example of deploying "hello world" with Shipyard

This exemplifies how the deployment on top of shipyard would work.
This would probably be best put in the example repo itself, but I
drafted it to make it clear how using Shipyard looks like.

Signed-off-by: Mike Kolesnik <mkolesni@redhat.com>

Author: mkolesnik

.example.hello-world.yml

@@ -0,0 +1,5 @@
+---
+nodes: control-plane worker
+clusters:
+  west:
+  east:

Makefile

@@ -138,6 +138,12 @@ ifneq (,$(DAPPER_HOST_ARCH))
 
 include $(SHIPYARD_DIR)/Makefile.clusters
 
+deploy-example-hello-world: SETTINGS=.example.hello-world.yml
+deploy-example-hello-world: build-cmd clusters
+	./scripts/$@.sh
+
+.PHONY: deploy-example-hello-world
+
 else
 
 # Not running in Shipyard's container

scripts/deploy-example-hello-world.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -em
+
+source "${SCRIPTS_DIR}/lib/utils"
+source "${SCRIPTS_DIR}/lib/debug_functions"
+
+print_env SETTINGS
+declare_kubeconfig
+
+on_ctx() {
+    "$2" --context "$1" "${@:3}"
+}
+
+# Create namespaces
+on_ctx west kubectl create namespace west
+kubectl config set-context west --namespace west
+on_ctx east kubectl create namespace east
+kubectl config set-context east --namespace east
+
+# Initialize and link
+on_ctx west ./skupper init --enable-console --enable-flow-collector
+on_ctx east ./skupper init
+on_ctx west ./skupper token create ${DAPPER_OUTPUT}/secret.token
+on_ctx east ./skupper link create ${DAPPER_OUTPUT}/secret.token
+
+# Deploy and expose services
+on_ctx west kubectl create deployment frontend --image quay.io/skupper/hello-world-frontend
+on_ctx west kubectl expose deployment/frontend --port 8080 --type LoadBalancer
+on_ctx east kubectl create deployment backend --image quay.io/skupper/hello-world-backend --replicas 3
+on_ctx east ./skupper expose deployment/backend --port 8080
+
+# Wait for service to become healthy
+svc_ip=$(on_ctx west kubectl get service/frontend -o jsonpath={.status.loadBalancer.ingress[0].ip})
+with_retries 30 sleep_on_fail 5s curl "http://${svc_ip}:8080/api/health"
+
+echo "Success! You can access the web UI at http://${svc_ip}:8080"