Update kestrel/.gitlab-ci.yml file

kestrel/.gitlab-ci.yml

@@ -6,7 +6,17 @@ stages:
 
 install_kestrel:
   stage: install_deps
-  image: trador/kestrel
+  image: trador/kestrel:latest
+  script:
+    - echo "kestrel ready"
+  cache:
+    key: "$CI_COMMIT_REF_SLUG-pip"
+    paths:
+      - .cache/pip
+  artifacts:
+    paths:
+      - /usr/local/lib/python3.9/site-packages/ 
+      - /usr/local/bin/kestrel
 
 execute_hunt:
   stage: run_hunts