Update alpha publishing to point to v3 branch

Author: andrewbranch

.github/workflows/main.yml

@@ -53,7 +53,7 @@ jobs:
       env:
         NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
   publish_alpha:
-    if: github.event_name == 'push' && endsWith(github.ref, 'v2')
+    if: github.event_name == 'push' && endsWith(github.ref, 'v3')
     needs: build_test
     name: publish alpha version to npm
     runs-on: ubuntu-latest