Cache Android Emulator generation

As outline in https://github.com/marketplace/actions/android-emulator-runner#usage--examples

we can cache the android emulator AVD generation.

Author: markushi

.github/workflows/agp-matrix.yml

@@ -54,6 +54,25 @@ jobs:
           sudo udevadm control --reload-rules
           sudo udevadm trigger --name-match=kvm
 
+      - 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@1dcd0090116d15e7c562f8db72807de5e036a4ed # pin@v2
+        with:
+          api-level: 30
+          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."
+
       # Clean, build and release a test apk
       - name: Make assembleUiTests
         run: make assembleUiTests
@@ -62,7 +81,7 @@ jobs:
       - name: Run instrumentation tests
         uses: reactivecircus/android-emulator-runner@1dcd0090116d15e7c562f8db72807de5e036a4ed # pin@v2
         with:
-          api-level: 30
+          api-level: 30          
           force-avd-creation: false
           emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
           disable-animations: true