Implement waitFor in .devcontainer.json

[bkneis]

Using the reference implementation I have implemented the waitFor enum defined by devcontainer.json, alongside the --skip-non-blocking-commands flag. The waitFor attribute actually does nothing without this flag, when combined, it allows a developer to skip life cycle hooks. I have tested locally by using devpod and devcontainer cli to run a .devcontainer.

➜  devpod git:(feature/wait-for) ✗ ./devpod-cli up --id hookstest1 ~/hooktest/ 
08:58:56 info Creating devcontainer...
08:58:56 info Running initializeCommand from devcontainer.json: 'sh -c echo ==================================== init'
08:58:56 info ==================================== init
08:58:56 info Inspecting image mcr.microsoft.com/devcontainers/python:1-3.12
08:58:57 info 5f79af92eaca15d84c29f6f269e0d3a5a2b13fdca8daa5d2cd7ea7aac42e4924
08:58:57 info Setup container...
08:58:58 info Chown workspace...
08:58:58 info Chown projects...
08:58:58 info Run command : echo ==================================== create...
08:58:58 info ==================================== create
08:58:58 done Successfully ran command : echo ==================================== create
08:58:58 info Run command : echo ==================================== content...
08:58:58 info ==================================== content
08:58:58 done Successfully ran command : echo ==================================== content
08:58:58 info Run command : echo ==================================== postcreate...
08:58:58 info ==================================== postcreate
08:58:58 done Successfully ran command : echo ==================================== postcreate
08:58:58 info Run command : echo ==================================== start...
08:58:58 info ==================================== start
08:58:58 done Successfully ran command : echo ==================================== start
08:58:58 info Run command : echo ==================================== attach...
08:58:58 info ==================================== attach
08:58:58 done Successfully ran command : echo ==================================== attach
08:58:58 info Download PyCharm from https://download.jetbrains.com/product?code=PY&platform=linux
08:58:58 info Extract PyCharm...
➜  devpod git:(feature/wait-for) ✗ ./devpod-cli up --id hookstest2 --skip-non-blocking-commands ~/hooktest/
08:59:17 info Creating devcontainer...
08:59:17 info Running initializeCommand from devcontainer.json: 'sh -c echo ==================================== init'
08:59:17 info ==================================== init
08:59:17 info Inspecting image mcr.microsoft.com/devcontainers/python:1-3.12
08:59:17 info 2658ceb386b94dee170e75378f45c91c568cf3ab1c186042688642581a5af9ff
08:59:18 info Setup container...
08:59:18 info Chown workspace...
08:59:18 info Chown projects...
08:59:18 info Run command : echo ==================================== create...
08:59:18 info ==================================== create
08:59:18 done Successfully ran command : echo ==================================== create
08:59:18 info Run command : echo ==================================== content...
08:59:18 info ==================================== content
08:59:18 done Successfully ran command : echo ==================================== content
08:59:18 info waited for updateContentCommands to finish, completed lifecycle hooks
08:59:18 info Download PyCharm from https://download.jetbrains.com/product?code=PY&platform=linux
08:59:18 info Extract PyCharm...

In the example here, you can see that all hooks are ran. If I then specify --skip-non-blocking-commands, only up to updateContentCommand is ran since this is what I set waitFor to.

.devcontainer.json

{
	"name": "Python 3",
	"image": "mcr.microsoft.com/devcontainers/python:1-3.12",
	"customizations": {
		"vscode": {
			"settings": {},
			"extensions": [
				"streetsidesoftware.code-spell-checker"
			]
		}
	},
	"portsAttributes": {
		"9000": {
			"label": "Hello Remote World",
			"onAutoForward": "notify"
		}
	},

	"initializeCommand": "echo ==================================== init",
	"onCreateCommand": "echo ==================================== create",
	"updateContentCommand": "echo ==================================== content",
	"postStartCommand": "echo ==================================== start",
	"postAttachCommand": "echo ==================================== attach",
	"waitFor": "updateContentCommand",
	"postCreateCommand": "echo ==================================== postcreate"
}

Fixes #162