Migrate to compose branch

This commit was made to allow cherry-picking the first commit of the followup commits according to https://github.com/ReVanced/revanced-manager-compose/issues/65#issue-1806335545

.github/workflows/pr-build.yml

@@ -1,45 +0,0 @@
-name: PR Build
-
-on:
-  pull_request:
-    paths: 
-      - ".github/workflows/pr-build.yml"
-      - "android/**"
-      - "assets/**"
-      - "lib/**"
-      
-jobs:
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          # Make sure the release step uses its own credentials:
-          # https://github.com/cycjimmy/semantic-release-action#private-packages
-          persist-credentials: false
-          fetch-depth: 0
-      - name: Setup JDK
-        uses: actions/setup-java@v3
-        with:
-          java-version: '11'
-          distribution: 'zulu'
-      - name: Setup Flutter
-        uses: subosito/flutter-action@v2
-        with:
-          channel: 'stable'
-          cache: true
-      - name: Install Flutter dependencies
-        run: flutter pub get
-      - name: Generate files with Builder
-        run: flutter packages pub run build_runner build --delete-conflicting-outputs
-      - name: Build with Flutter
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: flutter build apk --debug
-      - name: Upload build
-        uses: actions/upload-artifact@v3
-        with:
-          name: revanced-manager
-          path: build/app/outputs/flutter-apk/app-debug.apk