Add image arg to up command (#4385)

Using this argument, you can get more customization since you can do
`langgraph build` or directly `docker build` your image and then re-use
the `langgraph up --image my-image` and have it also spin up redis &
postgres for you.

Easier then writing your own compose file

libs/cli/langgraph_cli/docker.py

@@ -143,6 +143,8 @@ def compose_as_dict(
     debugger_base_url: Optional[str] = None,
     # postgres://user:password@host:port/database?option=value
     postgres_uri: Optional[str] = None,
+    # If you are running against an already-built image, you can pass it here
+    image: Optional[str] = None,
 ) -> dict:
     """Create a docker compose file as a dictionary in YML style."""
     if postgres_uri is None:
@@ -211,6 +213,8 @@ def compose_as_dict(
             "POSTGRES_URI": postgres_uri,
         },
     }
+    if image:
+        services["langgraph-api"]["image"] = image
 
     # If Postgres is included, add it to the dependencies of langgraph-api
     if include_db:
@@ -244,6 +248,7 @@ def compose(
     debugger_base_url: Optional[str] = None,
     # postgres://user:password@host:port/database?option=value
     postgres_uri: Optional[str] = None,
+    image: Optional[str] = None,
 ) -> str:
     """Create a docker compose file as a string."""
     compose_content = compose_as_dict(
@@ -252,6 +257,7 @@ def compose(
         debugger_port=debugger_port,
         debugger_base_url=debugger_base_url,
         postgres_uri=postgres_uri,
+        image=image,
     )
     compose_str = dict_to_yaml(compose_content)
     return compose_str