build: T6653: add build/manifest.json file

(cherry picked from commit 9928925)

scripts/image-build/build-vyos-image

@@ -549,6 +549,13 @@ if __name__ == "__main__":
  with open(file_path, 'w') as f:
  f.write(build_config["default_config"])
 
+ ## Initialize build manifest
+ manifest = {
+ 'build_config' : build_config,
+ 'artifacts' : [iso_file],
+ 'pre_build_config' : pre_build_config
+ }
+
  ## Configure live-build
  lb_config_tmpl = jinja2.Template("""
  lb config noauto \
@@ -627,6 +634,7 @@ Pin-Priority: 600
  # if the flavor calls for them
  if build_config["image_format"] != ["iso"]:
  raw_image = raw_image.create_raw_image(build_config, iso_file, "tmp/")
+ manifest['artifacts'].append(raw_image)
 
  if has_nonempty_key(build_config, "post_build_hook"):
  # Some flavors require special procedures that aren't covered by qemu-img
@@ -644,3 +652,7 @@ Pin-Priority: 600
  target = f"{os.path.splitext(raw_image)[0]}.{image_ext}"
  print(f"I: Building {f} file {target}")
  cmd(f"qemu-img convert -f raw -O {f} {image_opts} {raw_image} {target}")
+ manifest['artifacts'].append(target)
+
+ with open('manifest.json', 'w') as f:
+ f.write(json.dumps(manifest))