feat(chart): Configuration extra scripts mount to container

[VietND96]

Thanks for contributing to the Docker-Selenium project!
A PR well described will help maintainers to quickly review and merge it

Before submitting your PR, please check our contributing guidelines, applied for this repository.
Avoid large PRs, help reviewers by making them as simple and short as possible.

Description

feat(chart): Configuration extra scripts mount to container

Motivation and Context

Configuration extra scripts mount to container

This is supported for containers of browser node, video recorder and video uploader. By default, in these containers, there are scripts, config files implemented. In case you want to customize or replace them with your own implementation. Instead of forking the chart, use volume mount. Now, from your external files, you can insert them into ConfigMap via Helm CLI --set-file or compose them in your own YAML values file and pass to Helm CLI --values when deploying chart. Any files name that you defined will be picked up into ConfigMap and mounted to the container.

nodeConfigMap:
  extraScriptsDirectory: "/opt/selenium"
  extraScripts:
    nodePreStop.sh: |
      #!/bin/bash
      echo "Your custom script"

recorderConfigMap:
  extraScriptsDirectory: "/opt/selenium"
  extraScripts:
    video.sh: |
        #!/bin/bash
        echo "Your custom script"    
    videoPreStop.sh: |
        #!/bin/bash
        echo "My new script"

uploaderConfigMap:
  extraScriptsDirectory: "/opt/bin"
  extraScripts:
    entry_point.sh: |
        #!/bin/bash
        echo "Your custom entry point"
  secretFiles:
    config.conf: |
        [myremote]
        type = s3

Via Helm CLI, you can pass your own files to particular config key. Note that, the file name contains dot . for file extension, it will impact to the key name convention in Helm CLI. In this case, be careful to escape the dot . in the file name. For example a command in Unix:

helm upgrade -i test \
    --set-file 'nodeConfigMap.extraScripts.nodePreStop\.sh=/path/to/myScript.sh' \
    --set-file 'recorderConfigMap.extraScripts.video\.sh=/path/to/myCustom.sh' \
    selenium-grid

Files in .extraScripts will be mounted to the container with the same name within directory is defined in .extraScriptsDirectory. For example, in the above config, nodePreStop.sh will be mounted to /opt/selenium/nodePreStop.sh in the node container.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.