Run development workflow from target branch scope (#189)

Run the development workflow on the `pull_request_target` trigger which
runs the workflow from the scope of the target branch rather than the
merge branch. This should solve the permission failure in the build job.

Author: sjmonson

.github/workflows/development.yml

@@ -1,7 +1,7 @@
 name: Development
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, synchronize, reopened]
 
 jobs: