Fix GHA workflow

Author: justinyoo

.github/workflows/main.yaml

@@ -12,6 +12,10 @@ on:
     branches:
     - main
 
+env:
+  GH_PACKAGE_USERNAME: '${{ secrets.GH_PACKAGE_USERNAME }}'
+  GH_PACKAGE_TOKEN: '${{ secrets.GH_PACKAGE_TOKEN }}'
+
 jobs:
   build_and_test:
     name: Build and test packages