Use hash instead of branch for git clone hash.

limbo/limbo-pipeline.yaml

@@ -28,7 +28,7 @@ spec:
     params:
     - name: url
       value: ssh://git@git.jpace121.net:2222/limbo/$(params.gitea-repo-name).git
-    - name: branch
+    - name: hash
       value: $(params.sha)
     taskRef:
       name: j7s-git-clone-hash