Update GitLab MR Action to allow source branch to be deleted on merge

Signed-off-by: Aisha Saini <asaini1@jaguarlandrover.com>
Signed-off-by: asaini1 <asaini1@jaguarlandrover.com>

.changeset/old-onions-hear.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': minor
+---
+
+Update GitLab Merge Request Action to allow source branch to be deleted

plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/gitlabMergeRequest.ts

@@ -42,6 +42,7 @@ export const createPublishGitlabMergeRequestAction = (options: {
     token?: string;
     /** @deprecated Use projectPath instead */
     projectid?: string;
+    removeSourceBranch?: boolean;
   }>({
     id: 'publish:gitlab:merge-request',
     schema: {
@@ -85,6 +86,12 @@ export const createPublishGitlabMergeRequestAction = (options: {
             type: 'string',
             description: 'The token to use for authorization to GitLab',
           },
+          removeSourceBranch: {
+            title: 'Delete source branch',
+            type: 'boolean',
+            description:
+              'Option to delete source branch once the MR has been merged. Default: false',
+          },
         },
       },
       output: {
@@ -187,7 +194,10 @@ export const createPublishGitlabMergeRequestAction = (options: {
           destinationBranch,
           String(defaultBranch),
           ctx.input.title,
-          { description: ctx.input.description },
+          {
+            description: ctx.input.description,
+            removeSourceBranch: ctx.input.removeSourceBranch,
+          },
         ).then((mergeRequest: { web_url: string }) => {
           return mergeRequest.web_url;
         });