Add catalog/init just command

[krysal]

Fixes

An inconvenience of having to turn up the whole stack for testing catalog-only changes.

Description

This PR adapts the load_sample_data.sh script to accept an option for only loading the upstream DB data. Luckily the script was modular enough to make this a pretty easy change. Kudos to @dhruvkb here! This way the API command can continue working as usual.

Testing Instructions

Run the new command and try querying the upstream DB to see it's filled. This process returns zero results in main.

just down -v && just  catalog/init
# or
just catalog/recreate

# then verify with...
just catalog/pgcli

SELECT COUNT(*) FROM image;

-- Result must be:
+-------+
| count |
|-------|
| 5000  |
+-------+
SELECT 1

Also, confirms the just recreate and just api/recreate commands continue working as expected.

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[dhruvkb]

LGTM, same as before. I have one suggestion about waiting for the containers to be up but I won't block on it.

[AetherUnbound]

LGTM and works with just catalog/init on its own!