Added functionality to automatically assign a default 'redis_username' of 'default' when a StandaloneRedis instance is retrieved without an existing username. This ensures that all instances have a valid username, improving consistency and reducing potential errors in subsequent operations. Additionally, updated the redisUsername method to create a runtime environment variable for 'REDIS_USERNAME' with a default value if it does not already exist, enhancing the robustness of the configuration management.
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