[bitnami/milvus] Do not expose externalKafka.tls.keyPassword

[migruiz4]

Description of the change

Fixes the Milvus chart to not expose the externalKafka.tls.keyPassword in the init-container.

Applicable issues

• Relates [bitnami/milvus] feat: config external kafka tls client certs setting… #26118

Additional information

Pod root-coordinator no longer exposes the password in its init-container command:

     ...
      # Kafka TLS settings
      yq e -i '.kafka.ssl.enabled = true' /bitnami/milvus/rendered-conf/pre-render-config_01.yaml
      yq e -i '.kafka.ssl.tlsCert = "/opt/bitnami/milvus/configs/cert/kafka/client/tls.crt"' /bitnami/milvus/rendered-conf/pre-render-config_01.yaml
      yq e -i '.kafka.ssl.tlsKey = "/opt/bitnami/milvus/configs/cert/kafka/client/tls.key"' /bitnami/milvus/rendered-conf/pre-render-config_01.yaml
      yq e -i '.kafka.ssl.tlsCaCert = "/opt/bitnami/milvus/configs/cert/kafka/client/ca.crt"' /bitnami/milvus/rendered-conf/pre-render-config_01.yaml
      yq e -i '.kafka.ssl.tlsKeyPassword = "{{ MILVUS_KAFKA_TLS_KEY_PASSWORD }}"' /bitnami/milvus/rendered-conf/pre-render-config_01.yaml

Content of milvus.yaml:

# Kafka configuration
kafka:
  brokerList:
    - localhost:9092
  securityProtocol: PLAINTEXT
  ssl:
    enabled: true
    tlsCert: /opt/bitnami/milvus/configs/cert/kafka/client/tls.crt
    tlsKey: /opt/bitnami/milvus/configs/cert/kafka/client/tls.key
    tlsCaCert: /opt/bitnami/milvus/configs/cert/kafka/client/ca.crt
    tlsKeyPassword: 'my-pass'

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)