Add caching for emulator? (#29)

* Add caching for emulator?
* CI emulator test speed up
---------

Co-authored-by: Mads Mogensen <mail@madsmogensen.dk>

.github/workflows/frontend.yml

@@ -47,11 +47,31 @@ jobs:
         run: ./gradlew build -x test
       - name: Test (local)
         run: ./gradlew test -i
+      - name: AVD cache
+        uses: actions/cache@v3
+        id: avd-cache
+        with:
+          path: |
+            ~/.android/avd/*
+            ~/.android/adb*
+          key: avd
+      - 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: 29
+          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: Test (emulator)
         uses: reactivecircus/android-emulator-runner@v2
         with:
           api-level: 29
           working-directory: ./frontend
+          force-avd-creation: false
+          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
+          disable-animations: true
           script: ./gradlew connectedCheck
       - name: Report
         uses: FlickerSoul/android-test-report-actions@v1.2