add a label to signal that a deploy is connected with a recipe (!264)

Resolves coop-cloud/organising#391 by adding the following label `coop-cloud.${STACK_NAME}.recipe=${RECIPE}` (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: #264

cli/app/rollback.go

@@ -179,6 +179,7 @@ recipes.
 			logrus.Fatal(err)
 		}
 		config.ExposeAllEnv(stackName, compose, app.Env)
+		config.SetRecipeLabel(compose, stackName, app.Recipe)
 
 		if !internal.Force {
 			if err := internal.NewVersionOverview(app, deployedVersion, chosenDowngrade, ""); err != nil {

cli/app/upgrade.go

@@ -190,6 +190,7 @@ recipes.
 			logrus.Fatal(err)
 		}
 		config.ExposeAllEnv(stackName, compose, app.Env)
+		config.SetRecipeLabel(compose, stackName, app.Recipe)
 
 		if err := internal.NewVersionOverview(app, deployedVersion, chosenUpgrade, releaseNotes); err != nil {
 			logrus.Fatal(err)

cli/internal/deploy.go

@@ -135,6 +135,7 @@ func DeployAction(c *cli.Context) error {
 		logrus.Fatal(err)
 	}
 	config.ExposeAllEnv(app.StackName(), compose, app.Env)
+	config.SetRecipeLabel(compose, app.StackName(), app.Recipe)
 
 	if err := DeployOverview(app, version, "continue with deployment?"); err != nil {
 		logrus.Fatal(err)

pkg/config/app.go

@@ -464,3 +464,15 @@ func ExposeAllEnv(stackName string, compose *composetypes.Config, appEnv AppEnv)
 		}
 	}
 }
+
+// SetRecipeLabel adds the label 'coop-cloud.${STACK_NAME}.recipe=${RECIPE}' to the app container
+// to signal which recipe is connected to the deployed app
+func SetRecipeLabel(compose *composetypes.Config, stackName string, recipe string) {
+	for _, service := range compose.Services {
+		if service.Name == "app" {
+			logrus.Debugf("set recipe label 'coop-cloud.%s.recipe' to %s for %s", stackName, recipe, stackName)
+			labelKey := fmt.Sprintf("coop-cloud.%s.recipe", stackName)
+			service.Deploy.Labels[labelKey] = recipe
+		}
+	}
+}