Make zsh default shell in devContainer

[DocMoebiuz]

At the moment, when you open a shell in VSCode by clicking on the +-symbol a rudimentary shell is instantiated despite of the fact that we have ohmyzsh extension installed on purpose. zsh is only the second option.

Steps to reproduce:

• Start the vehicle app python template devContainer
• Open the terminal with ctrl+`
• Click + symbol to create an additional shell

Expected result:

• zsh is created

Actual result:

• bash shell is created

[DocMoebiuz]

use the options in devContainer.json for setting the default shell:

        [...]
        // Set *default* container specific settings.json values on container create.
	"settings": {
		[...]
		"terminal.integrated.defaultProfile.linux": "zsh", 
		"terminal.integrated.profiles.linux": {
			"zsh": {
				"path": "/bin/zsh"
			}
		}
	},
        [...]