compose: fix Redis password env var reference in backend service

[Nsanjayboruds]

Resolves #3541

Summary
The local Docker Compose configuration for the backend service incorrectly references the Redis host variable for the password, causing Redis authentication failures. This PR updates the environment variable to use the correct password reference.

File: compose.yml
Change

DJANGO_REDIS_PASSWORD: ${DJANGO_REDIS_HOST:-nest-cache-password}
+ DJANGO_REDIS_PASSWORD: ${DJANGO_REDIS_PASSWORD:-nest-cache-password}

Rationale
Prevents Redis authentication failures in local development
Ensures consistent environment variable usage across services
Aligns with the cache service (--requirepass $REDIS_PASSWORD) and the worker service, which already use the correct variable

Validation Steps
1.Set a custom password in Nest/backend/.env:

DJANGO_REDIS_PASSWORD=my-secure-password

2.Start the local stack:

make run

3.Confirm the backend starts without Redis auth errors and cache operations work.
4.Run project checks and tests:

make check-test

Scope & Risk
Limited to local development compose
One-line change; minimal risk
No impact on production/staging compose files

[github-actions]

The linked issue must be assigned to the PR author.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Summary by CodeRabbit

• Chores
  • Updated Redis password configuration resolution in the deployment setup to ensure proper credential handling when environment variables are not explicitly provided.

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Walkthrough

Updated the DJANGO_REDIS_PASSWORD environment variable in the local Docker Compose configuration to reference DJANGO_REDIS_PASSWORD instead of DJANGO_REDIS_HOST. This ensures correct Redis password resolution when the variable is not explicitly set.

Changes

Cohort / File(s)	Summary
Docker Compose Environment Configuration docker-compose/local/compose.yaml	Corrected DJANGO_REDIS_PASSWORD variable reference from using DJANGO_REDIS_HOST fallback to using DJANGO_REDIS_PASSWORD fallback, fixing Redis authentication resolution

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Avoid duplicate backend image builds in Docker Compose #2934: Adjusts worker Redis environment variable defaults in Docker Compose local configuration, sharing similar scope and intent with Redis configuration consistency.

Suggested reviewers

• arkid15r
• kasya

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud