Add changeset

Signed-off-by: Johan Haals <johan.haals@gmail.com>

.changeset/pink-ads-shave.md

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+---
+'@backstage/plugin-scaffolder': minor
+'@backstage/plugin-scaffolder-backend': minor
+---
+
+The scaffolder has been updated to support the new `v1beta2` template schema which allows for custom template actions!
+
+See documentation for more information how to create and register new template actions.
+
+**Breaking changes**
+
+The backend scaffolder plugin now needs a `UrlReader` which can be receieved from the PluginEnvironment.
+
+The following change is required in `backend/src/plugins/scaffolder.ts`
+
+```diff
+ export default async function createPlugin({
+   logger,
+   config,
+   database,
++  reader,
+ }: PluginEnvironment): Promise<Router> {
+
+  // omitted code
+
+  return await createRouter({
+    preparers,
+    templaters,
+    publishers,
+    logger,
+    config,
+    dockerClient,
+    database,
+    catalogClient,
++   reader,
+  });
+```