Replace deprecated `bitnamilegacy` Kafka images to ensure long-term stability

[igor-soldev]

Hi,

I noticed that both docker/docker-compose.kafka.yml and docker-edge/docker-compose.yml reference images from the bitnamilegacy namespace (versions 4.0 and 3.8.1).

The Problem
Relying on a repository explicitly named bitnamilegacy is not ideal for a production-grade IoT Edge platform. These images are often intended as temporary stopgaps, may not receive consistent security patches, and their long-term availability is not guaranteed compared to actively maintained upstream sources.

Proposed Solution
I suggest switching to soldevelo/kafka.
This image is an actively maintained, free drop-in replacement. It is built to preserve the standard Bitnami configuration structure (environment variables, paths, scripts), so your existing Compose setups will continue to work without modification, but backed by a stable, non-legacy source.

Suggested Changes:

In docker/docker-compose.kafka.yml:

# Old
image: "bitnamilegacy/kafka:4.0"

# New
image: "soldevelo/kafka:4.0"