scanservjs: ingress: Increase proxy read timeout

*scanserv-js* blocks the HTTP request while waiting for a scan to
complete.  For large, multi-page documents, the scan can take several
minutes.  To prevent the request from timing out and interrupting the
scan, we need to increase the proxy timeout configuration.

scanservjs/ingress.yaml

@@ -9,6 +9,7 @@ metadata:
     app.kubernetes.io/part-of: scanservjs
   annotations:
     nginx.ingress.kubernetes.io/proxy-body-size: '0'
+    nginx.ingress.kubernetes.io/proxy-read-timeout: '300'
     nginx.ingress.kubernetes.io/auth-method: GET
     nginx.ingress.kubernetes.io/auth-url: http://authelia.authelia.svc.cluster.local:9091/api/verify
     nginx.ingress.kubernetes.io/auth-signin: https://auth.pyrocufflink.blue/?rm=$request_method