Use reactivecircus/android-emulator-runner for E2E tests

Replaces manual sdkmanager/avdmanager/emulator setup with the
well-tested android-emulator-runner action which handles system image
install, AVD creation, emulator boot, and PATH setup automatically.

Author: xaionaro@dx.center

.github/workflows/ci.yml

@@ -73,41 +73,18 @@ jobs:
           sudo udevadm control --reload-rules
           sudo udevadm trigger --name-match=kvm
 
-      - name: Install Android SDK components and NDK
+      - name: Install Android NDK
         run: |
-          SDKMANAGER="$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager"
-          AVDMANAGER="$ANDROID_HOME/cmdline-tools/latest/bin/avdmanager"
-          yes | "$SDKMANAGER" --install \
-            "platform-tools" \
-            "emulator" \
-            "system-images;android-35;google_apis;x86_64" \
-            "platforms;android-35" || true
           wget -q "https://dl.google.com/android/repository/android-ndk-${ANDROID_NDK_VERSION}-linux.zip" -O /tmp/ndk.zip
           unzip -q /tmp/ndk.zip -d /tmp/ndk-extract/
           mkdir -p "$ANDROID_HOME/ndk"
           mv /tmp/ndk-extract/android-ndk-* "$ANDROID_HOME/ndk/${ANDROID_NDK_DIR_NAME}"
           echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/${ANDROID_NDK_DIR_NAME}" >> "$GITHUB_ENV"
 
-      - name: Create AVD
-        run: |
-          echo "no" | "$ANDROID_HOME/cmdline-tools/latest/bin/avdmanager" create avd \
-            -n e2e_examples -k "system-images;android-35;google_apis;x86_64" --force
-
-      - name: Start emulator
-        run: |
-          $ANDROID_HOME/emulator/emulator \
-            -avd e2e_examples -no-window -no-audio -no-boot-anim \
-            -gpu swiftshader_indirect -no-metrics &
-          echo "Waiting for emulator boot..."
-          adb wait-for-device
-          for i in $(seq 1 60); do
-            RESULT=$(adb shell getprop sys.boot_completed 2>/dev/null | tr -d '\r\n')
-            if [ "$RESULT" = "1" ]; then
-              echo "Emulator booted after ~$((i*5))s"
-              break
-            fi
-            sleep 5
-          done
-
-      - name: Run examples E2E
-        run: make e2e-examples
+      - name: Run examples on emulator
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: 35
+          target: google_apis
+          arch: x86_64
+          script: make e2e-examples