feat: add config-unset trigger

plugins/config/Makefile

@@ -1,6 +1,6 @@
 GOARCH ?= amd64
 SUBCOMMANDS = subcommands/bundle subcommands/clear subcommands/export subcommands/get subcommands/keys subcommands/show subcommands/set subcommands/unset
-TRIGGERS = triggers/config-export triggers/config-get triggers/config-get-global triggers/post-app-clone-setup triggers/post-app-rename-setup
+TRIGGERS = triggers/config-export triggers/config-get triggers/config-get-global triggers/config-unset triggers/post-app-clone-setup triggers/post-app-rename-setup
 BUILD = commands config_sub subcommands triggers
 PLUGIN_NAME = config
 

plugins/config/src/triggers/triggers.go

@@ -24,7 +24,7 @@ func main() {
 		global := flag.Arg(1)
 		merged := flag.Arg(2)
 		format := flag.Arg(3)
-		config.TriggerConfigExport(appName, global, merged, format)
+		err = config.TriggerConfigExport(appName, global, merged, format)
 	case "config-get":
 		appName := flag.Arg(0)
 		key := flag.Arg(1)
@@ -36,6 +36,16 @@ func main() {
 	case "config-get-global":
 		key := flag.Arg(0)
 		err = config.TriggerConfigGetGlobal(key)
+	case "config-unset":
+		appName := flag.Arg(0)
+		key := flag.Arg(1)
+		restart := flag.Arg(2)
+		if *global {
+			appName = "--global"
+			key = flag.Arg(0)
+			restart = flag.Arg(1)
+		}
+		err = config.TriggerConfigUnset(appName, key, common.ToBool(restart))
 	case "post-app-clone-setup":
 		oldAppName := flag.Arg(0)
 		newAppName := flag.Arg(1)

plugins/config/triggers.go

@@ -45,6 +45,12 @@ func TriggerConfigGetGlobal(key string) error {
 	return nil
 }
 
+// TriggerConfigUnset unsets an app config value by key
+func TriggerConfigUnset(appName string, key string, restart bool) error {
+	UnsetMany(appName, []string{key}, restart)
+	return nil
+}
+
 // TriggerPostAppCloneSetup creates new buildpacks files
 func TriggerPostAppCloneSetup(oldAppName string, newAppName string) error {
 	oldEnv, err := LoadAppEnv(oldAppName)