Run test on API 21 and API 30, and disable rate limiting on Synapse

.github/workflows/integration.yml

@@ -9,6 +9,9 @@ jobs:
   integration-tests:
     name: Integration Tests (Synapse)
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        api-level: [21, 30]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
@@ -36,10 +39,10 @@ jobs:
           python3 -m venv .synapse
           source .synapse/bin/activate
           pip install synapse matrix-synapse
-          curl -sL https://raw.githubusercontent.com/matrix-org/synapse/develop/demo/start.sh \
+          curl -sL https://raw.githubusercontent.com/matrix-org/synapse/develop/demo/start.sh --no-rate-limit \
             | sed s/127.0.0.1/0.0.0.0/g | bash
-      - name: Run integration tests
+      - name: Run integration tests on API ${{ matrix.api-level }}
         uses: reactivecircus/android-emulator-runner@v2
         with:
-          api-level: 29
+          api-level: ${{ matrix.api-level }}
           script: ./gradlew -PallWarningsAsErrors=false vector:connectedAndroidTest matrix-sdk-android:connectedAndroidTest