Override default RELATIVE_UPSTREAM_DB_* vars for integration tests

[AetherUnbound]

Fixes

Fixes #447 by @AetherUnbound

Description

This PR resolves an issue wherein the integration tests were failing after running just env. It turns out that the decouple library (which is being used to initialize the RELATIVE_UPSTREAM_DB_* variables) was picking up the variables in the .env file created under the ingestion_server directory. Since RELATIVE_UPSTREAM_DB_* is explicitly defined in the env.template file, it was overriding the default, which would normally fall back to the UPSTREAM_DB_* values. Since the services are named differently for integration tests, this would then cause the tests to fail.

There are a few ways to correct this, but the easiest seemed to be just to explicitly define them in the environment file for the service since decouple gives precedence to environment variables over those loaded from a .env file.

Testing Instructions

1. just env
2. just ing-testlocal

Checklist

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[dhruvkb]

Unexpectedly fairly straightforward!

[zackkrida]

Great!

[AetherUnbound]

Unexpectedly fairly straightforward!

Yet incredibly difficult to debug 😂 Turns out there are at least half a dozen ways to provide environment variables to the ingestion server haha