Thanos is not able to read redis password passed as environment variable

[BouchaaraAdil]

we don't have that problem with loki, and I think the reason is they use different redis package (go-redis), and also the interpretation of Password
Ref: https://github.com/grafana/loki/blob/main/pkg/storage/chunk/cache/redis_client.go#L69

with below config

    indexCacheConfig: |
      type: REDIS
      config:
        addr: ${THANOS_CACHE_REDIS_ENDPOINT}:6379
        password: ${THANOS_CACHE_REDIS_PASSWORD}
        ....

and

      - name: THANOS_CACHE_REDIS_PASSWORD
        valueFrom:
          secretKeyRef:
            name: thanos-metrics-redis
            key: password

we face

WRONGPASS invalid username-password pair or user is disabled.\ncreate REDIS index cache

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Verification