fix: svc/puppetboard forwarding to wrong port (#33)

puppetboard uses `PUPPETBOARD_PORT` to specify the port, otherwise it
listens on tcp/80

```
ENV PUPPETBOARD_PORT 80
ENV PUPPETBOARD_HOST 0.0.0.0
ENV PUPPETBOARD_STATUS_ENDPOINT /status
ENV PUPPETBOARD_SETTINGS docker_settings.py
EXPOSE 80
```

- change svc/puppetboard to use tcp/80

Reviewed-on: #33

apps/base/puppet/service_puppetboard.yaml

@@ -12,7 +12,7 @@ metadata:
 spec:
   ports:
   - name: puppetboard
-    port: 9090
+    port: 80
     protocol: TCP
     targetPort: puppetboard
   selector: