Update Registrator workflow (#51)

Author: mtfishman

.github/workflows/Registrator.yml

@@ -1,22 +1,19 @@
 name: Register Package
 on:
   workflow_dispatch:
-  pull_request:
-    types:
-      - closed
-    paths:
-      - 'Project.toml'
+  push:
     branches:
       - 'master'
       - 'main'
+    paths:
+      - 'Project.toml'
 
 permissions:
   contents: write
   pull-requests: write
 
 jobs:
   Register:
-    if: github.event_name == 'workflow_dispatch' || github.event.pull_request.merged == true
     uses: "ITensor/ITensorActions/.github/workflows/Registrator.yml@main"
     with:
       localregistry: ITensor/ITensorRegistry