feat: enhance task runner with task status updates and process command execution

- Added a task status update to 'processing' at the start of the Run method in runner.go, improving task tracking.
- Removed redundant task status update from the end of the Run method to streamline the execution flow.
- Updated command execution in process.go to use 'bash' instead of 'sh' for better compatibility across environments.

core/utils/process.go

@@ -16,7 +16,7 @@ func BuildCmd(cmdStr string) (cmd *exec.Cmd, err error) {
 	if runtime.GOOS == "windows" {
 		return exec.Command("cmd", "/C", cmdStr), nil
 	}
-	return exec.Command("sh", "-c", cmdStr), nil
+	return exec.Command("bash", "-c", cmdStr), nil
 }
 
 func ProcessIdExists(pid int) (exists bool) {