Store specified environment in configuration for reference (#104)

bundle/config/bundle.go

@@ -10,4 +10,7 @@ type Bundle struct {
 	// TODO
 	// Default warehouse to run SQL on.
 	// DefaultWarehouse string `json:"default_warehouse,omitempty"`
+
+	// Environment is set by the mutator that selects the environment.
+	Environment string `json:"environment,omitempty"`
 }

bundle/config/mutator/select_environment.go

@@ -38,6 +38,9 @@ func (m *selectEnvironment) Apply(root *config.Root) ([]Mutator, error) {
 		return nil, err
 	}
 
+	// Store specified environment in configuration for reference.
+	root.Bundle.Environment = m.name
+
 	// Clear environments after loading.
 	root.Environments = nil
 	return nil, nil