CI: make gradlew executable before build (Linux runner)

Author: eried

.github/workflows/branch-apk.yml

@@ -41,6 +41,9 @@ jobs:
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v3
 
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
       - name: Build debug APK
         run: ./gradlew :app:assembleDebug --no-daemon --stacktrace
         env: