Run instrumented tests on multiple API levels

- Add matrix strategy for API levels 24, 30, 32, and 37
- Update test name to include API level
- Configure device API level via environment variable
- Remove AVD caching step
- Update system image source based on API level

Author: rfc2822

.github/workflows/tests.yml

@@ -53,11 +53,19 @@ jobs:
   test_on_emulator:
     needs: compile
     if: ${{ !cancelled() }}     # even if compile didn't run (because not on main branch)
-    name: Instrumented tests
+    name: Instrumented tests (API ${{ matrix.api-level }})
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        api-level:
+          - 24  # Android 7 (minSdk level)
+          - 30  # Android 11
+          - 32  # Android 12L
+          - 37  # Android 17
     env:
       apk-dir: lib/apk
       fdroid-packages: "at.techbee.jtx org.dmfs.tasks org.tasks"
+      API_LEVEL: ${{ matrix.api-level }}
     steps:
       - uses: gradle/actions/setup-gradle@v6
         with:
@@ -117,11 +125,5 @@ jobs:
           sudo udevadm control --reload-rules
           sudo udevadm trigger --name-match=kvm
 
-      - name: Cache AVD
-        uses: actions/cache@v5
-        with:
-          path: ~/.config/.android/avd
-          key: avd-${{ hashFiles('lib/build.gradle.kts') }}   # gradle-managed devices are defined there
-
       - name: Run device tests
         run: ./gradlew virtualCheck

lib/build.gradle.kts

@@ -72,8 +72,9 @@ android {
             localDevices {
                 create("virtual") {
                     device = "Pixel 3"
-                    apiLevel = 33
-                    systemImageSource = "aosp-atd"
+                    // Read API level from environment variable, fallback to Android 15 (35)
+                    apiLevel = System.getenv("API_LEVEL")?.toIntOrNull() ?: 35
+                    systemImageSource = if (apiLevel > 30) "aosp-atd" else "aosp"
                 }
             }
         }