feat: one-line install for agents and probes from one shared script (curl | bash, zsh, PowerShell) [CI]

ci/stage-node-image.py

@@ -35,6 +35,7 @@ def stage(component: str, destination: Path) -> None:
     restore.mkdir(parents=True)
     source.mkdir(parents=True)
     shutil.copy2(CONTAINERFILES[component], destination / "Containerfile")
+    shutil.copy2(ROOT / "packaging/container/entrypoint.sh", destination / "entrypoint.sh")
 
     for path in BACKEND.rglob("*"):
         if not path.is_file() or IGNORED_PARTS.intersection(path.parts):