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/docker.rs

@@ -1,14 +1,15 @@
-use super::DockerCommand;
 use anyhow::Result;
 
+use crate::command_builder::CommandBuilder;
+
 pub fn stop_all() -> Result<()> {
-    let running_containers = DockerCommand::docker().args("ps -q").stdout()?;
+    let running_containers = CommandBuilder::docker().args("ps -q").exec_get_stdout()?;
 
     if running_containers.is_empty() {
         return Ok(());
     }
 
-    DockerCommand::docker()
+    CommandBuilder::docker()
         .args(&format!("stop {running_containers}"))
-        .spawn_wait()
+        .exec()
 }