ci: build the dev images in parallel with the checks and gate only the push [CI]

ci/stage-node-image.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 
 import argparse
 import shutil
+import subprocess
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -28,6 +29,20 @@ CONTAINERFILES = {
 }
 
 
+def copy_for_restore(path: Path, relative: Path, target: Path) -> None:
+    """The restore layer must not change when only the build version does: CI rewrites <Version> in the workspace
+    Directory.Build.props (ci/version.sh), which used to invalidate the cached dependency restore on every commit.
+    Restore only needs the committed props (package versions); the source copy still carries the real version."""
+    if path.name == "Directory.Build.props":
+        committed = subprocess.run(
+            ["git", "show", f"HEAD:backend/{relative.as_posix()}"], cwd=ROOT, capture_output=True, check=False
+        )
+        if committed.returncode == 0:
+            target.write_bytes(committed.stdout)
+            return
+    shutil.copy2(path, target)
+
+
 def stage(component: str, runtime_identifier: str, destination: Path) -> None:
     if destination.exists():
         shutil.rmtree(destination)
@@ -49,7 +64,7 @@ def stage(component: str, runtime_identifier: str, destination: Path) -> None:
         ):
             target = restore / relative
             target.parent.mkdir(parents=True, exist_ok=True)
-            shutil.copy2(path, target)
+            copy_for_restore(path, relative, target)
         target = source / relative
         target.parent.mkdir(parents=True, exist_ok=True)
         shutil.copy2(path, target)