fix: crash bug when adding a bundle file with no tag

Author: sflanker

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+### Fixed
+
+- Crash when running `gatecheck bundle add` with no tags
+
 ## [0.7.5] - 2024-06-18
 
 ### Fixed

cmd/cli-config.go

@@ -45,7 +45,7 @@ var RuntimeConfig = metaConfig{
 	BundleTag: configkit.MetaField{
 		FieldName:    "BundleTag",
 		EnvKey:       "GATECHECK_BUNDLE_TAG",
-		DefaultValue: "",
+		DefaultValue: []string{},
 		FlagValueP:   new([]string),
 		EnvToValueFunc: func(s string) any {
 			return strings.Split(s, ",")