Add changesets

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: blam<ben@blam.sh>
Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/afraid-teachers-cross.md

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+---
+'@backstage/create-app': patch
+---
+
+Pass on plugin database management instance that is now required by the scaffolder plugin.
+
+To apply this change to an existing application, add the following to `src/plugins/scaffolder.ts`:
+
+```diff
+export default async function createPlugin({
+  logger,
+  config,
++  database,
+}: PluginEnvironment) {
+
+// ...omitted...
+
+  return await createRouter({
+    preparers,
+    templaters,
+    publishers,
+    logger,
+    config,
+    dockerClient,
+    entityClient,
++    database,
+  });
+}
+```

.changeset/large-terms-invite.md

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+---
+'@backstage/plugin-scaffolder-backend': minor
+---
+
+Introduced `v2` Scaffolder REST API, which uses an implementation that is database backed, making the scaffolder instances stateless. The `createRouter` function now requires a `PluginDatabaseManager` instance to be passed in, commonly available as `database` in the plugin environment in the backend.
+
+This API should be considered unstable until used by the scaffolder frontend.