feat: fix duplicate CI checks in pull requests (#88)

Author: Copilot

.github/workflows/build.yml

@@ -1,6 +1,10 @@
 name: Build
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 env:
   SHA: ${{ GITHUB.SHA }}

.github/workflows/release.yml

@@ -1,6 +1,9 @@
 name: Release
 
-on: push
+on:
+  push:
+    branches:
+      - master
 
 env:
   SHA: ${{ GITHUB.SHA }}