invoice-ninja: Deploy Invoice Ninja

Invoice Ninja is a small business management tool.  Tabitha wants to
use it for HLC.

I am a bit concerned about the code quality of this application, and
definitely alarmed at the data it send upstream, so I have tried to be
extra careful with it.  All privileges are revoked, including access to
the Internet.

invoice-ninja/ingress.yaml

@@ -0,0 +1,19 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: invoice-ninja
+  labels:
+    app.kubernetes.io/name: invoice-ninja
+    app.kubernetes.io/component: invoice-ninja
+spec:
+  rules:
+  - host: invoiceninja.pyrocufflink.blue
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: invoice-ninja
+            port:
+              name: http