And fix this as well

Author: malfet

.jenkins/get_docker_tag.py

@@ -5,9 +5,14 @@
 }
 
 if __name__ == "__main__":
-    url = "https://api.github.com/repos/pytorch/pytorch/contents/.circleci"
+    url = "https://api.github.com/repos/pytorch/pytorch/contents/.ci"
 
     response = requests.get(url, headers=REQUEST_HEADERS)
-    for file in response.json():
-        if file["name"] == "docker":
-            print(file["sha"])
+    docker_sha = None
+    for finfo in response.json():
+        if finfo["name"] == "docker":
+            docker_sha = finfo["sha"]
+            break
+    if docker_sha is None:
+        raise RuntimeError("Can't find sha sum of docker folder")
+    print(docker_sha)