Launching vscode with some default extensions installed

[vitaliy-guliy]

What does this PR do?

Allows to start the editor with some default extensions.

The idea is to upload the extension binary to the container (using a post start command for instance) and then define DEFAULT_EXTENSIONS environment variable to allow the editor use the extension on the startup.

What issues does this PR fix?

https://issues.redhat.com/browse/CRW-7246

How to test this PR?

• create a workspace using the editor image quay.io/che-incubator-pull-requests/che-code:pr-424-amd64

once workspace started, ensure no extensions are installed (except built-in)

• open the devfile, add post start command to download the extensions and then restart the workspace from local devfile

  - id: add-default-extensions
    exec:
      # put your tooling container name here
      component: runtime
      commandLine: |
        # download regular binary
        curl https://open-vsx.org/api/atlassian/atlascode/3.0.10/file/atlassian.atlascode-3.0.10.vsix --location -o /tmp/atlassian.atlascode-3.0.10.vsix
        curl https://open-vsx.org/api/snowflake/snowflake-vsc/1.9.1/file/snowflake.snowflake-vsc-1.9.1.vsix --location -o /tmp/snowflake.snowflake-vsc-1.9.1.vsix

events:
  postStart:
    - add-default-extensions

• add the configmap, the workspace should be restarted

kind: ConfigMap
apiVersion: v1
metadata:
  name: default-extensions
  labels:
    controller.devfile.io/mount-to-devworkspace: 'true'
    controller.devfile.io/watch-configmap: 'true'
  annotations:
    controller.devfile.io/mount-as: env
data:
  DEFAULT_EXTENSIONS: '/tmp/atlassian.atlascode-3.0.10.vsix;/tmp/snowflake.snowflake-vsc-1.9.1.vsix'

• refresh the editor page, both extensions should be installed.

Does this PR contain changes that override default upstream Code-OSS behavior?

• the PR contains changes in the code folder (you can skip it if your changes are placed in a che extension )
• the corresponding items were added to the CHANGELOG.md file
• rules for automatic git rebase were added to the .rebase folder

[github-actions]

Click here to review and test in web IDE:

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[github-actions]

Pull Request images published ✨

Editor: quay.io/che-incubator-pull-requests/che-code:pr-424-amd64
Dev image: quay.io/che-incubator-pull-requests/che-code-dev:pr-424-dev-amd64

[devstudio-release]

Build 3.18 :: code_3.x/1492: Console, Changes, Git Data