feat: ship renovate.jsonc extending the shared preset

README.md

@@ -11,6 +11,13 @@ A part is a directory with:
 
 Application services carry the `services` profile, databases and other infrastructure carry `external`.
 
+The root also gets a `renovate.jsonc` that is nothing but an `extends` on the
+shared preset in `templates/renovate`. It does not subscribe the repo to
+anything on its own: the bot walks an explicit list, so a new repo still has to
+be added to `repositories` in `projects/personal/renovate/renovate-config.js`
+of `infra/komodo`, and needs the `renovate`, `wait-3d` and `deps-code` labels
+(`giteaproject <org>/<repo>` creates them).
+
 ```sh
 copier copy --trust -d layout=parts -d 'parts=["backend","frontend"]' <this-repo> <dest>
 copier update -a .copier/infra.yml

template/renovate.jsonc

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["local>templates/renovate"]
+}