fix: correct Redis environment variable name inconsistency in api/.env.sample

[lamtrinhdev]

PR type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other... Please describe:

Sample environment configuration.

PR checklist

Please check if your PR fulfills the following requirements:

• I have read the CONTRIBUTING.md doc
• The Git workflow follows our guidelines: CONTRIBUTING.md#git
• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

What is the current behavior?

Issue number: N/A

The code in config/config.go:150 uses REDIS_ADDRESSES as the environment variable name, but the .env.sample file defines REDIS_ADDRS. This inconsistency causes the Redis configuration to fail when using .env.sample (the environment variable is never read correctly.).

What is the new behavior?

Changed REDIS_ADDRS to REDIS_ADDRESSES in .env.sample to match the environment variable defined in config/config.go.

Does this PR introduce a breaking change?

• Yes
• No

[lamtrinhdev]

Dear @jurajhilje ,

I just update a small thing. When you have time, please help me to review it.

Thanks,
Lam