feat: add screenshot dumper

scripts/scrot.py

@@ -0,0 +1,23 @@
+import subprocess
+from pathlib import Path
+
+from dzgui.app_init import build_gui
+
+
+def get_git_root() -> Path:
+    proc = subprocess.run(
+        ["git", "rev-parse", "--show-toplevel"], capture_output=True, text=True
+    )
+    if proc.returncode != 0:
+        raise OSError("Failed to parse git root")
+    return Path(proc.stdout.rstrip())
+
+
+def get_image_path() -> Path:
+    return get_git_root().joinpath("dzgui/data/images/example.png")
+
+
+p = get_image_path()
+app = build_gui("", False)
+app.set_automation_param("screenshot_path", p)
+app.run(None)