test: clean up yarn test

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/dagger.io/dagger/utils.cue

@@ -8,6 +8,12 @@ import (
 // This may safely be called from any package
 #Source: engine.#Source
 
+// A (best effort) persistent cache dir
+#CacheDir: engine.#CacheDir
+
+// A temporary directory for command execution
+#TempDir: engine.#TempDir
+
 // Select a subdirectory from a filesystem tree
 #Subdir: {
 	// Input tree