fix(restore): bind custom CNPG group and version env vars

The restore command was missing the CUSTOM_CNPG_GROUP and
CUSTOM_CNPG_VERSION environment variable bindings that other
commands (e.g. instance) already had.

Author: armru

internal/cmd/restore/main.go

@@ -57,6 +57,8 @@ func NewCmd() *cobra.Command {
 	_ = viper.BindEnv("pod-name", "POD_NAME")
 	_ = viper.BindEnv("pgdata", "PGDATA")
 	_ = viper.BindEnv("spool-directory", "SPOOL_DIRECTORY")
+	_ = viper.BindEnv("custom-cnpg-group", "CUSTOM_CNPG_GROUP")
+	_ = viper.BindEnv("custom-cnpg-version", "CUSTOM_CNPG_VERSION")
 
 	return cmd
 }