feat: add compose exec and compose bash commands

Exec is new command scoped under compose. It allows sending commands
directly into appserver container. I will make this
customizable/controllable in the future.

src/command_builder.rs

@@ -24,6 +24,12 @@ impl From<&String> for Args {
     }
 }
 
+impl From<&[String]> for Args {
+    fn from(value: &[String]) -> Self {
+        Self(Vec::from_iter(value.iter().map(|x| x.to_string())))
+    }
+}
+
 #[derive(Default)]
 pub struct CommandBuilder {
     args: Vec<String>,