remove pr workflow

.github/workflows/pr-build.yml

@@ -1,39 +0,0 @@
-name: WeatherMaster PR Build
-
-on:
-  pull_request:
-    types: [ opened, synchronize, reopened ]
-  workflow_dispatch:
-
-jobs:
-  build:
-    runs-on: ubuntu-24.04
-
-    steps:
-      - name: Checkout PR
-        uses: actions/checkout@v4
-
-      - name: Grant execute permission for gradlew
-        run: chmod +x gradlew
-
-      - name: Set up JDK 21
-        uses: actions/setup-java@v5
-        with:
-          distribution: temurin
-          java-version: "21.0.7"
-
-      - name: Setup Android SDK
-        uses: android-actions/setup-android@v3
-
-      - name: Build debug APK
-        run: |
-          ./gradlew \
-            --no-daemon \
-            --no-build-cache \
-            clean assembleDebug
-
-      - name: Upload APK
-        uses: actions/upload-artifact@v4
-        with:
-          name: pr-debug-apk
-          path: app/build/outputs/apk/debug/*.apk