feat: custom command builder

Implemented custom command builder with nicer api suited for my needs.
Also returned error if there are no containers in
`scripts::postgres::get_containers`.

src/scripts/django.rs

@@ -1,12 +1,13 @@
-use crate::scripts::{create_file, safe_create_file};
-
-use super::DockerCommand;
-use anyhow::{anyhow, Result};
 use std::env;
 use std::fs::create_dir;
 use std::io::Write;
 use std::path::{Path, PathBuf};
 
+use anyhow::{anyhow, Result};
+
+use crate::command_builder::CommandBuilder;
+use crate::{create_file, safe_create_file};
+
 fn get_django_settings_module() -> Result<String> {
     let dsm = env::var("DJANGO_SETTINGS_MODULE")?;
     println!("USING: {dsm}");
@@ -64,7 +65,7 @@ pub fn manage(rest: &[String]) -> Result<()> {
     let dsm = get_django_settings_module()?;
     let joined = rest.join(" ");
     let command = format!("exec appserver python manage.py {joined} --settings={dsm}");
-    DockerCommand::docker_compose().args(&command).spawn_wait()
+    CommandBuilder::docker_compose().args(&command).exec()
 }
 
 // shortcuts