Merge pull request #419 from ritazh/gh_prtemplate

docs: update PR template for chart updates

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,4 +3,8 @@
 **Which issue(s) this PR fixes** *(optional, using `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when the PR gets merged)*:
 Fixes #
 
-**Special notes for your reviewer**:
+<!--
+**Is this a chart or deployment yaml update?**
+If yes, please update the yamls in the [manifest_staging/](https://github.com/kubernetes-sigs/secrets-store-csi-driver/tree/master/manifest_staging/) folder, where we host the staging charts and deployment yamls. All the yaml changes will then be promoted into the released charts folder with the next release. Please also add the new configurable values to the configuration [table](https://github.com/kubernetes-sigs/secrets-store-csi-driver/tree/master/manifest_staging/charts/secrets-store-csi-driver#configuration). 
+-->
+**Special notes for your reviewer**: