refactor: migrate the app deploy lock to the data directory

This removes it from the app path, hopefully making backups a bit easier to perform.

plugins/apps/functions.go

@@ -17,8 +17,8 @@ func appExists(appName string) error {
 
 // checks if an app is locked
 func appIsLocked(appName string) bool {
-	lockfilePath := fmt.Sprintf("%v/.deploy.lock", common.AppRoot(appName))
-	_, err := os.Stat(lockfilePath)
+	lockPath := getLockPath(appName)
+	_, err := os.Stat(lockPath)
 	return !os.IsNotExist(err)
 }
 
@@ -94,6 +94,11 @@ func destroyApp(appName string) error {
 	return nil
 }
 
+// returns the lock path
+func getLockPath(appName string) string {
+	return fmt.Sprintf("%v/.deploy.lock", common.GetDataDirectory(appName))
+}
+
 // creates an app if allowed
 func maybeCreateApp(appName string) error {
 	if err := appExists(appName); err == nil {