storage: Add manifest for Longhorn

I was originally going to use GlusterFS to provide persistent storage
for pods, but [Heketi][0], the component that provides the API for
the Kubernetes StorageClass, is in "deep maintenance" status and looks
to be practically dead.  I was a bit afraid to try to use it because of
that, and went looking for guidance on Reddit, which is how I discovered
Longhorn.

storage/longhorn-ingress.yaml

@@ -0,0 +1,29 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: longhorn-ingress
+  namespace: longhorn-system
+  annotations:
+    # type of authentication
+    nginx.ingress.kubernetes.io/auth-type: basic
+    # prevent the controller from redirecting (308) to HTTPS
+    nginx.ingress.kubernetes.io/ssl-redirect: 'false'
+    # name of the secret that contains the user/password definitions
+    nginx.ingress.kubernetes.io/auth-secret: basic-auth
+    # message to display with an appropriate context why the authentication is required
+    nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required '
+    # custom max body size for file uploading like backing image uploading
+    nginx.ingress.kubernetes.io/proxy-body-size: 10000m
+spec:
+  ingressClassName: nginx
+  rules:
+  - host: longhorn.pyrocufflink.blue
+    http:
+      paths:
+      - pathType: Prefix
+        path: /
+        backend:
+          service:
+            name: longhorn-frontend
+            port:
+              number: 80