Adding optional string array of topics to publish gitlab action

Signed-off-by: Josh Maxwell <jmaxwell@qualtrics.com>

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

@@ -44,6 +44,7 @@ export function createPublishGitlabAction(options: {
     gitAuthorName?: string;
     gitAuthorEmail?: string;
     setUserAsOwner?: boolean;
+    topics?: string[];
   }>({
     id: 'publish:gitlab',
     description:
@@ -99,6 +100,14 @@ export function createPublishGitlabAction(options: {
             description:
               'Set the token user as owner of the newly created repository. Requires a token authorized to do the edit in the integration configuration for the matching host',
           },
+          topics: {
+            title: 'Topic labels',
+            description: 'Topic labels to apply on the repository.',
+            type: 'array',
+            items: {
+              type: 'string',
+            },
+          },
         },
       },
       output: {
@@ -128,6 +137,7 @@ export function createPublishGitlabAction(options: {
         gitAuthorName,
         gitAuthorEmail,
         setUserAsOwner = false,
+        topics = [],
       } = ctx.input;
       const { owner, repo, host } = parseRepoUrl(repoUrl, integrations);
 
@@ -175,6 +185,8 @@ export function createPublishGitlabAction(options: {
         visibility: repoVisibility,
       });
 
+      await client.Projects.edit(projectId, {topics});
+
       // When setUserAsOwner is true the input token is expected to come from an unprivileged user GitLab
       // OAuth flow. In this case GitLab works in a way that allows the unprivileged user to
       // create the repository, but not to push the default protected branch (e.g. master).