[+] add hook for GoReleaser to build WebUI

.goreleaser.yml

@@ -4,6 +4,7 @@ before:
   hooks:
     # weirdly goreleaser doesn't all to include outside of the Go build "root" so need to copy
     - cp -r grafana ./src/
+    - sh -c "cd ./src/webui && yarn install && yarn build"
 
 builds:
 - dir: src