Use the gradle plugin (same usage as in element-android) to standardise caching.

This may or may not speed up build times.

.github/workflows/tests.yml

@@ -25,6 +25,10 @@ jobs:
         uses: actions/checkout@v3
         with:
           lfs: 'true'
+      - name: Configure gradle
+        uses: gradle/gradle-build-action@v2
+        with:
+          cache-read-only: ${{ github.ref != 'refs/heads/develop' }}
 
       - name: ⚙️ Run unit & screenshot tests, generate kover report
         run: ./gradlew koverMergedReport $CI_GRADLE_ARG_PROPERTIES -Pci-build=true