feat: enhance APK build process and update README with release information

Author: dinkar-jain

.github/workflows/create-release.yml

@@ -63,7 +63,7 @@ jobs:
 
       - name: Build debug APK
         if: ${{ steps.detect.outputs.exists == 'true' }}
-        run: ./gradlew :waltid-applications:waltid-wallet-demo-compose:androidApp:assembleDebug --no-daemon --console=plain --warning-mode=summary
+        run: ./gradlew :waltid-applications:waltid-wallet-demo-compose:androidApp:assembleDebug -PappVersionName=${{ inputs.version }} --no-daemon --console=plain --warning-mode=summary
         env:
           CI: "true"
           MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}

waltid-applications/waltid-wallet-demo-compose/README.md

@@ -50,6 +50,10 @@ Android builds can override it with `-PtransactionDataProfiles.url=...`. Compose
 - Web/Wasm is currently a mock UI preview wired to `createMockDemoWallet()`. It does not exercise the mobile wallet SDK, platform key storage, SQLDelight persistence, EUDI flows, or Enterprise flows.
 - Production web wallet support is expected to live outside this mobile demo app. If a shared web UI is needed later, the shared UI module may need to move or split around the final web architecture.
 
+## Release APK
+
+Each GitHub release attaches a debug-signed `waltid-wallet-demo-compose-<version>.apk`, built with `assembleDebug`. Because CI signs with a fresh, throwaway debug key per release, a release APK **cannot upgrade a previously installed one** — uninstall the existing app first, then install the new one. Uninstalling resets local wallet data (see [Local wallet data](#local-wallet-data)).
+
 ## Common commands
 
 Android and shared UI:

waltid-applications/waltid-wallet-demo-compose/androidApp/build.gradle.kts

@@ -8,6 +8,14 @@ plugins {
 val javaVersion = identityLibs.versions.java.library.get().toInt()
 val publicDemoTransactionDataProfilesUrl = "https://wallet.demo.walt.id/wallet-api/transaction-data-profiles"
 
+val appVersionName: String = (findProperty("appVersionName") as String?)?.takeIf { it.isNotBlank() } ?: "0.1.0"
+val appVersionCode: Int = run {
+    val core = appVersionName.trimStart('v', 'V').substringBefore('-').substringBefore('+')
+    val parts = core.split('.')
+    fun slot(i: Int) = (parts.getOrNull(i)?.toIntOrNull() ?: 0).coerceIn(0, 999)
+    (slot(0) * 1_000_000L + slot(1) * 1_000L + slot(2)).coerceIn(1L, 2_100_000_000L).toInt()
+}
+
 android {
     namespace = "id.walt.walletdemo.compose.android"
     compileSdk = 37
@@ -16,8 +24,8 @@ android {
         applicationId = "id.walt.walletdemo.compose"
         minSdk = 30
         targetSdk = 37
-        versionCode = 1
-        versionName = "0.1.0"
+        versionCode = appVersionCode
+        versionName = appVersionName
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
 
         buildConfigField("String", "ATTESTATION_BASE_URL", "\"${findProperty("attestation.baseUrl") ?: ""}\"")