Or is this preferable?

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build APK
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Build Release APK
+        run: ./gradlew assembleRelease
+      - name: Upload
+        uses: actions/upload-artifact@v2
+        with:
+          name: android-davsync
+          path: app/build/outputs/apk/release/app-release-unsigned.apk
+

app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 22
+    compileSdkVersion 29
     buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "net.zekjur.davsync"
         minSdkVersion 14
-        targetSdkVersion 22
+        targetSdkVersion 29
     }
 
     buildTypes {

app/src/main/AndroidManifest.xml

@@ -5,8 +5,7 @@
     android:versionName="1.3" >
 
     <uses-sdk
-        android:minSdkVersion="14"
-        android:targetSdkVersion="17" />
+        android:targetSdkVersion="29" />
 
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.INTERNET" />
@@ -72,4 +71,4 @@
         </activity>
     </application>
 
-</manifest>
+</manifest>

build.gradle

@@ -1,15 +1,21 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
+        maven {
+           url 'https://maven.google.com'
+        }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:4.2.0'
     }
 }
 
 allprojects {
     repositories {
+        google()
+        mavenCentral()
         jcenter()
     }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Sun Oct 22 22:24:17 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip