turn off r cmd check action

Author: atyrell3

.github/workflows/R-CMD-check.yaml

@@ -1,8 +1,7 @@
 # Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
 # Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
 on:
-  push:
-  pull_request:
+  workflow_dispatch:
 
 name: R-CMD-check.yaml