ci: Cache AVD snapshots to speed up Android tests (#4030)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

.github/workflows/reusable-android-test.yml

@@ -55,6 +55,26 @@ jobs:
           build-scan-terms-of-use-agree: 'yes'
           add-job-summary: always
 
+      - name: AVD cache
+        uses: actions/cache@v4
+        id: avd-cache
+        with:
+          path: |
+            ~/.android/avd/*
+            ~/.android/adb*
+          key: avd-${{ matrix.api-level }}
+
+      - name: create AVD and generate snapshot for caching
+        if: steps.avd-cache.outputs.cache-hit != 'true'
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: ${{ matrix.api-level }}
+          arch: x86_64
+          force-avd-creation: false
+          emulator-options: -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
+          disable-animations: false
+          script: echo "Generated AVD snapshot for caching."
+
       - name: Run Android Instrumented Tests
         uses: reactivecircus/android-emulator-runner@v2
         env:
@@ -63,9 +83,10 @@ jobs:
           api-level: ${{ matrix.api-level }}
           arch: x86_64
           force-avd-creation: false
-          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -no-metrics -camera-back none
+          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
           disable-animations: true
           script: ./gradlew :app:connectedFdroidDebugAndroidTest :app:connectedGoogleDebugAndroidTest --configuration-cache --scan && ( killall -INT crashpad_handler || true )
+
       - name: Upload test results to Codecov
         if: ${{ !cancelled() }}
         uses: codecov/test-results-action@v1

build-logic/convention/src/main/kotlin/com/geeksville/mesh/buildlogic/KotlinAndroid.kt

@@ -30,6 +30,8 @@ import org.jetbrains.kotlin.gradle.dsl.KotlinAndroidProjectExtension
 import org.jetbrains.kotlin.gradle.dsl.KotlinBaseExtension
 import org.jetbrains.kotlin.gradle.dsl.KotlinJvmProjectExtension
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import java.io.FileInputStream
+import java.util.Properties
 
 /**
  * Configure base Kotlin with Android options
@@ -37,11 +39,18 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 internal fun Project.configureKotlinAndroid(
     commonExtension: CommonExtension<*, *, *, *, *, *>,
 ) {
+    val configPropertiesFile = rootProject.file("config.properties")
+    val configProperties = Properties()
+
+    if (configPropertiesFile.exists()) {
+        FileInputStream(configPropertiesFile).use { configProperties.load(it) }
+    }
+
     commonExtension.apply {
-        compileSdk = 36
+        compileSdk = configProperties.get("COMPILE_SDK").toString().toInt()
 
         defaultConfig {
-            minSdk = 26
+            minSdk = configProperties.get("MIN_SDK").toString().toInt()
         }
 
         compileOptions {