Update build.yml to refine push and pull_request triggers

Author: ndonkoHenri

.github/dependabot.yml

@@ -6,6 +6,7 @@ updates:
     schedule:
       interval: "daily"
       time: "22:40"
+    target-branch: "main"
     open-pull-requests-limit: 1
     versioning-strategy: "increase"
     allow:

.github/workflows/build.yml

@@ -1,9 +1,20 @@
 name: Flet Build
 
 on:
-  push:
   workflow_dispatch:
+  push:
+    branches:
+      - main
+      - dev
+    paths-ignore:
+      - '.github/dependabot.yml'
+      - 'LICENSE'
+      - 'README.md'
   pull_request:
+    paths-ignore:
+      - '.github/dependabot.yml'
+      - 'LICENSE'
+      - 'README.md'
 
 env:
   UV_PYTHON: 3.12