do not pull when we build from specified cache in ci

.gitlab-ci.yml

@@ -13,22 +13,16 @@ build-tag:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
   script:
     - IMAGE_1="$CI_REGISTRY_IMAGE/pvs_core"
-    - docker pull "$IMAGE_1":latest || true
     - docker build --cache-from "$IMAGE_1":latest -t "$IMAGE_1":dev -t "$IMAGE_1":$CI_COMMIT_TAG core/
     - IMAGE_2="$CI_REGISTRY_IMAGE/pvs_preprocessor"
-    - docker pull "$IMAGE_2":latest || true
     - docker build --cache-from "$IMAGE_2":latest -t "$IMAGE_2":dev -t "$IMAGE_2":$CI_COMMIT_TAG preprocessor/
     - IMAGE_3="$CI_REGISTRY_IMAGE/pvs_client"
-    - docker pull "$IMAGE_3":latest || true
     - docker build --cache-from "$IMAGE_3":latest -t "$IMAGE_3":dev -t "$IMAGE_3":$CI_COMMIT_TAG client/
     - IMAGE_4="$CI_REGISTRY_IMAGE/pvs_cache"
-    - docker pull "$IMAGE_4":latest || true
     - docker build --cache-from "$IMAGE_4":latest -t "$IMAGE_4":dev -t "$IMAGE_4":$CI_COMMIT_TAG cache/
     - IMAGE_5="$CI_REGISTRY_IMAGE/fluentd"
-    - docker pull "$IMAGE_5":latest || true
     - docker build --cache-from "$IMAGE_5":latest -t "$IMAGE_5":dev -t "$IMAGE_5":$CI_COMMIT_TAG fluentd/
     - IMAGE_6="$CI_REGISTRY_IMAGE/pvs_ingestor"
-    - docker pull "$IMAGE_6":latest || true
     - docker build --cache-from "$IMAGE_6":latest -t "$IMAGE_6":dev -t "$IMAGE_6":$CI_COMMIT_TAG ingestor/
     - cd ./testing && ./gitlab_test.sh
     - if [ $? -ne 0 ]; then exit 1; fi  # actually fail build