Add optional locked plugin download URLs

src/plugin_helper/models.py

@@ -42,6 +42,7 @@ class LockedPlugin:
     tag: str | None
     asset: str | None
     sha256: str | None
+    download_url: str | None = None
     install_strategy: str | None = None
     reason: str | None = None
 
@@ -72,6 +73,8 @@ def lockfile_to_toml(lockfile: Lockfile) -> str:
             lines.append(f"tag = {_quote_toml_string(plugin.tag)}")
         if plugin.asset is not None:
             lines.append(f"asset = {_quote_toml_string(plugin.asset)}")
+        if plugin.download_url is not None:
+            lines.append(f"download_url = {_quote_toml_string(plugin.download_url)}")
         if plugin.sha256 is not None:
             lines.append(f"sha256 = {_quote_toml_string(plugin.sha256)}")
         if plugin.install_strategy is not None:
@@ -156,6 +159,7 @@ def load_lockfile(path: Path) -> Lockfile:
             tag=item.get("tag"),
             asset=item.get("asset"),
             sha256=item.get("sha256"),
+            download_url=item.get("download_url"),
             install_strategy=item.get("install_strategy"),
             reason=item.get("reason"),
         )