Can't start the template project because pgvector not installed in the docker image.

[PEIslander]

I got the following error message trying to start the memory-agent template.

`Failed to start project memory-agent
info | Setting up vector index
error | Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 693, in lifespan
async with self.lifespan_context(app) as maybe_state:
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/contextlib.py", line 210, in aenter
return await anext(self.gen)
^^^^^^^^^^^^^^^^^^^^^
File "/api/langgraph_api/lifespan.py", line 29, in lifespan
File "/usr/local/lib/python3.12/site-packages/langgraph_storage/database.py", line 149, in start_pool
await migrate_vector_index()
File "/usr/local/lib/python3.12/site-packages/langgraph_storage/database.py", line 138, in migrate_vector_index
await lg_store.setup_vector_index(store)
File "/usr/local/lib/python3.12/site-packages/langgraph_storage/store.py", line 94, in setup_vector_index
await cur.execute(sql)
File "/usr/local/lib/python3.12/site-packages/psycopg/cursor_async.py", line 97, in execute
raise ex.with_traceback(None)
psycopg.errors.FeatureNotSupported: extension "vector" is not available
DETAIL: Could not open extension control file "/usr/share/postgresql/16/extension/vector.control": No such file or directory.
HINT: The extension must first be installed on the system where PostgreSQL is running.

error | Application startup failed. Exiting.`

After figuring out how/where to install this pgvector extension in that postgre:16 docker image, the problem was solved.

Hopefully, this will be fixed. It is confusing for someone who's just getting started with LangGraph studio.