fix(compose): wait for healthchecks before starting osprey-ui-api

[haileyok]

Description

Converts osprey-ui-api.depends_on in docker-compose.yaml from the bare list form to the long form with condition: keys, so the container waits for postgres to be service_healthy before starting.

On a clean boot the osprey-ui-api container was crashing with:

psycopg2.OperationalError: could not translate host name "postgres" to address: Name or service not known

The bare list form of depends_on only waits for the dependency container to be started, not ready. Postgres already defines a pg_isready healthcheck (line 260), so we can wait on it properly.

For the three other dependencies (osprey-worker, druid-broker, snowflake-id-worker), no healthcheck: is defined, so they stay on service_started. Adding healthchecks for those is plausible follow-up work but out of scope here.

Closes #96 (sub-item 2 of the friction log).

Changes

• osprey-ui-api.depends_on: bare list -> long form with explicit condition: per dep
  • postgres: service_healthy (has pg_isready healthcheck)
  • osprey-worker, druid-broker, snowflake-id-worker: service_started (no healthcheck defined)

Testing

Live boot verification deferred to the operator (a live osprey stack is running on this machine and shouldn't be disturbed).

Static verification:

• docker compose -f docker-compose.yaml config --quiet -> exit 0
• python3 -c "import yaml; yaml.safe_load(open('docker-compose.yaml'))" -> OK
• Rendered config shows all four entries resolve with the expected condition and required: true.

Checklist

• Static docker compose config validates
• No scope creep (only the osprey-ui-api.depends_on block changed)
• Live docker compose up boot verified by operator

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