CI: remove action-docker-layer-caching

There is no speed up gain, it is even slower

.github/workflows/e2e_tests.yml

@@ -77,13 +77,6 @@ jobs:
       - name: Pull docker images
         run: ./run-docker pull
 
-      # In this step, this action saves a list of existing images,
-      # the cache is created without them in the post run.
-      # It also restores the cache if it exists.
-      - uses: jpribyl/[email protected]
-        # Ignore the failure of a step and avoid terminating the job.
-        continue-on-error: true
-
       - name: Build and start docker images
         run: ./run-docker up --build -d