Only deploy the accelerator on a push to main (Azure-Samples#345)

* Only build on main push

* Add npm to Dependabot

Author: ross-p-smith

.github/dependabot.yml

@@ -22,3 +22,8 @@ updates:
     schedule:
       interval: "weekly"
     open-pull-requests-limit: 50
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 50

.github/workflows/ci.yml

@@ -1,8 +1,6 @@
 name: CI
 
 on:
-  workflow_dispatch:
-  pull_request:
   push:
     branches:
       - main