Cache CI images to speedup build

Issue: BB-449

.github/workflows/tests.yaml

@@ -23,8 +23,6 @@ jobs:
 
     - name: Set up Docker Buildk
       uses: docker/setup-buildx-action@v2
-      with:
-        buildkitd-flags: --debug
 
     - name: Login to Registry
       uses: docker/login-action@v2
@@ -39,8 +37,8 @@ jobs:
         push: true
         context: .github/dockerfiles/kafka
         tags: "ghcr.io/scality/backbeat/ci-kafka:${{ github.sha }}"
-        cache-from: type=gha
-        cache-to: type=gha,mode=max
+        cache-from: type=gha,scope=ci-kafka
+        cache-to: type=gha,mode=max,scope=ci-kafka
 
     - name: Build and push syntheticbucketd
       uses: docker/build-push-action@v4
@@ -49,17 +47,17 @@ jobs:
         context: .
         file: .github/dockerfiles/syntheticbucketd/Dockerfile
         tags: "ghcr.io/scality/backbeat/syntheticbucketd:${{ github.sha }}"
-        cache-from: type=gha
-        cache-to: type=gha,mode=max
+        cache-from: type=gha,scope=syntheticbucketd
+        cache-to: type=gha,mode=max,scope=syntheticbucketd
 
     - name: Build and push MongoDB
       uses: docker/build-push-action@v4
       with:
         push: true
         context: .github/dockerfiles/mongodb
         tags: "ghcr.io/scality/backbeat/ci-mongodb:${{ github.sha }}"
-        cache-from: type=gha
-        cache-to: type=gha,mode=max
+        cache-from: type=gha,scope=ci-mongodb
+        cache-to: type=gha,mode=max,scope=ci-mongodb
 
   tests:
     needs: build