Fix flaky tests

Signed-off-by: dubo-dubon-duponey <dubodubonduponey+github@pm.me>

tests/plan/outputs/files/relative.cue

@@ -0,0 +1,15 @@
+package main
+
+import "dagger.io/dagger"
+
+dagger.#Plan & {
+	outputs: files: {
+		[path=string]: dest: path
+		test_relative: contents: """
+			#!/bin/bash
+			set -euo pipefail
+			echo "Hello World!"
+
+			"""
+	}
+}