builds: switch to ubuntu

.builds/android.yml

@@ -1,6 +1,6 @@
-image: alpine/latest
+image: ubuntu/jammy
 packages:
-  - openjdk18
+  - openjdk-18-jdk
   - gradle
   - maven
 sources:
@@ -16,3 +16,9 @@ tasks:
       export ANDROID_HOME=~/android-sdk
       cd KordophoneDroid/
       ./gradlew assembleRelease
+  - prepare: |
+      cp app/build/outputs/apk/release/app-release-unsigned.apk ~/kordophone.apk
+artifacts:
+  - kordophone.apk
+
+