Add GitHub Actions CI workflow for build status

.github/workflows/android.yml

@@ -0,0 +1,42 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Cache Gradle packages
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+
+    - name: Run lint
+      run: ./gradlew lint
+
+    - name: Build with Gradle
+      run: ./gradlew build
+
+    - name: Run tests
+      run: ./gradlew testDebugUnitTest

NyanDroid/build.gradle.kts

@@ -3,6 +3,8 @@ plugins {
     kotlin("android")
 }
 
+// Added GitHub Actions CI workflow for automated builds and testing
+
 allprojects {
     repositories {
         google()

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/powerje/NyanDroid.svg?branch=master)](https://travis-ci.org/powerje/NyanDroid)
+[![Android CI](https://github.com/powerje/NyanDroid/workflows/Android%20CI/badge.svg)](https://github.com/powerje/NyanDroid/actions/workflows/android.yml)
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 
 Live wallpaper celebrating Ice Cream Nyanwiches. Available on [Google Play](https://play.google.com/store/apps/details?id=com.powerje.nyan "NyanDroid on Google Play") and [F-Droid](https://www.f-droid.org/packages/com.powerje.nyan "NyanDroid on F-Droid").