Revert "builds for all branches, deploy only for main."

This reverts commit 5af8097.

.github/workflows/build.yaml

@@ -4,20 +4,20 @@ on:
   workflow_dispatch:
   push:
     branches:
-      - '**'
+      - main
   pull_request:
     branches:
-      - '**'
+      - main
+  # schedule:
+  #   # Runs at 00:00 UTC every day
+  #   - cron: '0 0 * * *'
 
 permissions:
   contents: write
 
 jobs:
   deploy:
-    if: |
-      github.event_name == 'push' ||
-      github.event_name == 'workflow_dispatch' ||
-      (github.event_name == 'pull_request' && github.base_ref == 'main')
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -42,6 +42,7 @@ jobs:
           mike deploy --push dev -t "dev"
 
   build:
+    if: github.event_name == 'pull_request' || github.event_name == 'schedule'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3