message: don't inherit vars from top level
diff: @@ -203,16 +203,12 @@ impl Manifest {
  if let Some(webpack_config) = &environment.webpack_config {
  target.webpack_config = Some(webpack_config.clone());
  }
  - if let Some(target_vars) = &mut target.vars.clone() {
  - if let Some(env_vars) = environment.vars.clone() {
  - target_vars.extend(env_vars);
  - let new_vars = target_vars.clone();
  - target.vars.replace(new_vars);
  - }
  - }
  // don't inherit kv namespaces because it is an anti-pattern to use the same namespaces across multiple environments
  target.kv_namespaces = environment.kv_namespaces.clone();
  +
  + // don't inherit vars
  + target.vars = environment.vars.clone();
  }
  Ok(target)
  