Modify workflow to point at main

.github/workflows/dart.yml

@@ -3,11 +3,10 @@ name: Dart
 on:
   # Run CI on pushes to the master branch, and on PRs against master.
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
-  schedule:
-    - cron: "0 0 * * 0"
+    branches: [main]
+  workflow_dispatch:
 
 jobs:
   # Check code formatting and static analysis on a single OS (linux)

.github/workflows/publish.yaml

@@ -1,12 +0,0 @@
-name: Publish
-permissions:
-  id-token: write
-  pull-requests: write
-on:
-  pull_request:
-    branches: [ master ]
-  push:
-    tags: [ 'v[0-9]+.[0-9]+.[0-9]+' ]
-jobs:
-  publish:
-    uses: dart-lang/ecosystem/.github/workflows/publish.yaml@main