add a label to signal that a deploy is a chaos deploy (!265)

Resolves coop-cloud/organising#390 by adding the following label `coop-cloud.${STACK_NAME}.chaos=true` (according to the version label).
This is required for the auto updater coop-cloud/organising#236 (comment)

Co-authored-by: Moritz <moritz.m@local-it.org>
Reviewed-on: coop-cloud/abra#265

cli/internal/deploy.go

@@ -136,6 +136,7 @@ func DeployAction(c *cli.Context) error {
 	}
 	config.ExposeAllEnv(app.StackName(), compose, app.Env)
 	config.SetRecipeLabel(compose, app.StackName(), app.Recipe)
+	config.SetChaosLabel(compose, app.StackName(), Chaos)
 
 	if err := DeployOverview(app, version, "continue with deployment?"); err != nil {
 		logrus.Fatal(err)