add missing file

 * used for doing something minimally useful when the image is run
   outside of Prefect

Author: JunAishima

test.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+import sys
+
+
+def test(stuff=""):
+    if stuff:
+        print(f"test: {stuff}")  # noqa: T201
+    else:
+        print("test: EMPTY")  # noqa: T201
+
+
+if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        test(sys.argv[1])
+    else:
+        test()