tweaks

csst_dag/dag_config/csst-msc-l1-ast.yml

 name: csst-msc-l1-ast
 tasks:
 - name: AST
-  image: csst-msc-l1-ast
+  image: csst-msc-l1-ast-astrometry
 #- name: SSO
 #  dependencies: [AST]
 #  image: csst-msc-l1-ast-sso
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