Replace Bitnami Kafka image with a free compatible alternative

[igor-soldev]

The file dockerfiles/devicehive-kafka.Dockerfile currently uses:

FROM docker.io/bitnami/kafka:3.1

Since Bitnami has introduced access restrictions to many of their images, this may cause pull failures for users building or running DeviceHive.

A free, Bitnami-compatible drop-in replacement such as soldevelo/kafka can be used instead. It preserves the /bitnami/... layout, runs as non-root, and tracks upstream Kafka versions.
Link: https://hub.docker.com/r/soldevelo/kafka

If acceptable, I can submit a PR updating this Dockerfile.

[igor-soldev]

Hi team, checking in on this.

Currently, the build process defined in devicehive-kafka.Dockerfile is likely failing for new users due to the image restrictions. Switching the base image would immediately restore buildability without requiring any logic changes.

Would you be open to a PR for this?