chore: add changeset

Signed-off-by: blam <ben@blam.sh>

.changeset/silent-papayas-dress.md

@@ -0,0 +1,38 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Enable the JSON parsing of the response from templated variables in the `v2beta1` syntax. Previously if template parameters json strings they were left as strings, they are now parsed as JSON objects.
+
+Before:
+
+```yaml
+- id: test
+  name: test-action
+  action: custom:run
+  input:
+    input: '{"hello":"ben"}'
+```
+
+Now:
+
+```yaml
+- id: test
+  name: test-action
+  action: custom:run
+  input:
+    input:
+      hello: ben
+```
+
+Also added the `parseRepoUrl` and `json` helpers to the parameters syntax. You can now use these helpers to parse work with some `json` or `repoUrl` strings in templates.
+
+```yaml
+- id: test
+  name: test-action
+  action: cookiecutter:fetch
+  input:
+    destination: '{{ parseRepoUrl parameters.repoUrl }}'
+```
+
+Will produce a parsed version of the `repoUrl` of type `{ repo: string, owner: string, host: string }` that you can use in your actions. Specifically `cookiecutter` with `{{ cookiecutter.destination.owner }}` like the `plugins/scaffolder-backend/sample-templates/v1beta2-demo/template.yaml` example.