Apply development config in Helm charts (#3161)

This isn't the best fix because we're still using NODE_ENV=development
in a "production" environment. Ideally we would stop doing this.

Right now, the Helm charts are broken because they deploy the backend
straight into Error state.. This change will unbreak them for the
moment.

contrib/docker/kubernetes-example-backend/Dockerfile

@@ -30,6 +30,4 @@ RUN yarn install --frozen-lockfile --production
 # Do not use this Dockerfile outside of that command, as it will copy in the source code instead.
 COPY . .
 
-CMD ["node", "packages/backend"]
-
-
+CMD ["node", "packages/backend", "--config", "app-config.yaml", "--config", "app-config.development.yaml"]