Give the ability to trigger devcontainer rebuild from scripts (git hooks, etc.)

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Give the ability to trigger a rebuild on a git branch switch or provide a way to trigger a rebuild from scripts (eg. git hooks).

This would provide a way for developers to be sure they are working with an up-to-date environment corresponding to used technology and languages versions.

For example if you're working on a php project, started with v7.3 of PHP, you may have a feature branch aiming to upgrade the project to php v8.1, so developers should be able to switch to that feature branch to have the work done as they would switch between other feature or fix branches for other works, and be sure the corresponding Docker containers and used images are coherent with current project Dockerfile. In this scenario, a simple git hooks should be able to trigger a devcontainer rebuild to match project organization and requirements.