enable kaniko caching

.gitlab-ci.yml

@@ -10,4 +10,4 @@ build:
   script:
     - mkdir -p /kaniko/.docker
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:latest --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_BRANCH --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA --snapshotMode=redo
+    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:latest --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_BRANCH --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA --snapshotMode=redo --cache=true