fix: prompt does not find external commands #3134 (#3189)

the initial setup-commands of nushell were executed without loading environment variables
this resulted in the PATH not being available at this point until an external command was run once
which resulted in env_vars being added
let run_result = run_block(&prompt_block, &context, InputStream::empty()).await;

Co-authored-by: alexhk <alexhk@protonmail.com>

crates/nu-cli/src/cli.rs

@@ -214,6 +214,9 @@ pub async fn cli(mut context: EvaluationContext, options: Options) -> Result<(),
     // Give ourselves a scope to work in
     context.scope.enter_scope();
 
+    let env = context.get_env();
+    context.scope.add_env_to_base(env);
+
     let history_path = nu_engine::history_path(&configuration);
     let _ = rl.load_history(&history_path);