Test using Maestro CLI + emulator instead of Cloud (#4092)

Add Maestro local CI workflow:
- Remove previous Maestro Cloud.
- Use an emulator with Pixel 7 Pro - API 35.
- Allow to record several videos in the background to verify the run.
- Upload test results.
- Allow either dispatching a new flow, running the 'build apk' job or run with a PR after the 'Build APK' flow has succeeded.

.github/workflows/build.yml

@@ -54,6 +54,16 @@ jobs:
           path: |
             app/build/outputs/apk/gplay/debug/*-universal-debug.apk
             app/build/outputs/apk/fdroid/debug/*-universal-debug.apk
+      - name: Upload x86_64 APK for Maestro
+        if: ${{ matrix.variant == 'debug' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: elementx-apk-maestro
+          path: |
+            app/build/outputs/apk/gplay/debug/app-gplay-x86_64-debug.apk
+          retention-days: 5
+          overwrite: true
+          if-no-files-found: error
       - uses: rnkdsh/action-upload-diawi@v1.5.5
         id: diawi
         # Do not fail the whole build if Diawi upload fails