Add the gha build cache backend for the funnel-ci build step in the p…

…ytest docker workflow

.github/workflows/pytest-docker.yml

@@ -31,8 +31,8 @@ jobs:
         uses: actions/checkout@v3
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
-      - name: Build funnel-test image
-        id: build-funnel-test
+      - name: Build funnel-ci image
+        id: build-funnel-ci
         uses: docker/build-push-action@v4
         with:
           context: .
@@ -41,6 +41,8 @@ jobs:
           tags: funnel-ci
           load: true
           push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       - name: Set permissions for coverage
         run: docker compose -f docker-compose.ci.yml run -u root --entrypoint "" --no-deps --quiet-pull main chown -R 1000:1000 coverage
       - name: Test with pytest