ci: build amd64 on opt-in main commits [CI SKIP]

ci/stage-node-image.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+"""Stage source and restore files for the Linux amd64 Agent or Probe image build."""
+
+from __future__ import annotations
+
+import argparse
+import shutil
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+BACKEND = ROOT / "backend"
+IGNORED_PARTS = {".git", ".release", "artifacts", "bin", "obj", "TestResults", "tests"}
+GLOBAL_BACKEND_FILES = {
+    "Directory.Build.props",
+    "Directory.Build.targets",
+    "Directory.Packages.props",
+    "global.json",
+    "NuGet.Config",
+    "NuGet.config",
+}
+CONTAINERFILES = {
+    "agent": ROOT / "packaging/container/Agent.NativeBuild.Containerfile",
+    "probe": ROOT / "packaging/container/Probe.NativeBuild.Containerfile",
+}
+
+
+def stage(component: str, destination: Path) -> None:
+    if destination.exists():
+        shutil.rmtree(destination)
+    restore = destination / "restore/backend"
+    source = destination / "source/backend"
+    restore.mkdir(parents=True)
+    source.mkdir(parents=True)
+    shutil.copy2(CONTAINERFILES[component], destination / "Containerfile")
+
+    for path in BACKEND.rglob("*"):
+        if not path.is_file() or IGNORED_PARTS.intersection(path.parts):
+            continue
+        relative = path.relative_to(BACKEND)
+        if (
+            path.suffix in {".csproj", ".props", ".targets", ".slnx"}
+            or path.name in GLOBAL_BACKEND_FILES
+            or path.name == "packages.lock.json"
+        ):
+            target = restore / relative
+            target.parent.mkdir(parents=True, exist_ok=True)
+            shutil.copy2(path, target)
+        target = source / relative
+        target.parent.mkdir(parents=True, exist_ok=True)
+        shutil.copy2(path, target)
+
+    config = destination / "config"
+    config.mkdir()
+    (config / ".keep").write_text("", encoding="utf-8")
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("component", choices=tuple(CONTAINERFILES))
+    parser.add_argument("destination", type=Path)
+    args = parser.parse_args()
+    stage(args.component, args.destination)
+
+
+if __name__ == "__main__":
+    main()