Feature to allow adding sidecars through helm overrides

[MichaelSPaik]

Purpose

Current deployment model prevents adding sidecars such as filebeat without having to pull the helm chart and injecting custom deployment.yaml

Goals

implementation of a templated sidecar from helm overrides increases flexibility for consumers

Approach

The implementation is just a simple toYaml from the helm overrides

User stories

Summary of user stories addressed by this change>

Release note

Add the ability to add custom sidecars from helm overrides

Documentation

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Training

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Certification

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Automation tests

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Security checks

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Samples

sidecar:
- name: filebeat-sidecar
  command: ["/bin/bash"]
  args: ["-c", "exec /entrypoint/entrypoint.sh"]
  image: docker.elastic.co/beats/filebeat:8.19.14
  imagePullPolicy: Always
  resources: {}
  terminationMessagePath: /dev/termination-log
  terminationMessagePolicy: File
  volumeMounts:
    - mountPath: /home/wso2carbon/logs
      name: logs

Related PRs

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Migrations (if applicable)

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Test environment

N/A

Learning

N/A

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