example: added simple kubernetes example

Signed-off-by: Sam Alba <sam.alba@gmail.com>

examples/kubernetes/main.cue

@@ -0,0 +1,41 @@
+package main
+
+import (
+    "encoding/yaml"
+    "dagger.io/aws"
+    "dagger.io/aws/eks"
+    "dagger.io/kubernetes"
+)
+
+kubeSrc: {
+    apiVersion: "v1"
+    kind:       "Pod"
+    metadata: {
+        name: "kube-test"
+    }
+    spec: {
+        restartPolicy: "Never"
+        containers: [{
+            name:  "test"
+            image: "hello-world"
+        }]
+    }
+}
+
+// Fill using:
+//          --input-string awsConfig.accessKey=XXX
+//          --input-string awsConfig.secretKey=XXX
+awsConfig: aws.#Config & {
+	region: *"us-east-2" | string
+}
+
+cluster: eks.#KubeConfig & {
+	config:      awsConfig
+	clusterName: *"dagger-example-eks-cluster" | string
+}
+
+apply: kubernetes.#Apply & {
+    source: yaml.Marshal(kubeSrc)
+    namespace: "test"
+    kubeconfig: cluster.kubeconfig
+}