Allow mongodb host config (#52)

* Fix bug

* Add dependdency

Author: lvarin

requirements.txt

@@ -1,2 +1,3 @@
 connexion>=2.11.2,<3.0.0
 foca==0.12.1
+yq==3.2.3

update-config-map.sh

@@ -38,6 +38,7 @@ echo "Current Kubernetes namespace: $NAMESPACE"; echo
 echo " * Getting current default configuration"
 
 APP_CONFIG=$(yq --arg HOST_NAME "$HOST_NAME" \
+                --arg MONGO_HOST "$MONGO_HOST" \
     '.endpoints.service.url_prefix = "https" |
      .endpoints.service.external_host = $HOST_NAME |
      .endpoints.service.external_port = 443 |