Add github actions CI and fix the build

.github/workflows/android.yml

@@ -0,0 +1,24 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: set up JDK
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: gradle
+
+    - name: Build with Gradle
+      run: gradle build

README.md

@@ -31,7 +31,7 @@ The app will be installed on all devices accessible to `adb`.
 This project makes a few assumptions about your environment in order
 to build correctly:
 
-* You have `gradle` 8.7+ installed - there is no [Gradle Wrapper][]
+* You have `gradle` 8.11+ installed - there is no [Gradle Wrapper][]
   included.
 * You have `JAVA_HOME` set up. If you have `java` in your path, you
   should be good to go.

build.gradle

@@ -4,22 +4,23 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.5.2'
+        classpath 'com.android.tools.build:gradle:8.10.0'
     }
 }
 
 repositories {
     google()
+    mavenCentral()
 }
 
 apply plugin: 'com.android.application'
 
 android {
     namespace "pl.czak.minimal"
 
-    compileSdkVersion 34
+    compileSdkVersion 35
 
     defaultConfig {
-        targetSdk 34
+        targetSdk 35
     }
 }