ci: use default token for project workflow

Author: deleonio

.github/workflows/add-issues-to-project.yml

@@ -1,8 +1,8 @@
 name: Add Issues to Project
 
 # Requires a repository variable named `PUBLIC_UI_PROJECT_URL` that contains the
-# GitHub Project (beta) URL and a secret named `PUBLIC_UI_PROJECT_TOKEN` holding
-# a fine-grained PAT with `project: write` access to that board.
+# GitHub Project (beta) URL. The workflow uses the default `GITHUB_TOKEN`, so no
+# additional PAT secret is necessary.
 
 on:
   issues:
@@ -13,6 +13,7 @@ on:
 
 permissions:
   contents: read
+  projects: write
 
 jobs:
   add-to-project:
@@ -23,4 +24,4 @@ jobs:
         uses: actions/[email protected]
         with:
           project-url: ${{ vars.PUBLIC_UI_PROJECT_URL }}
-          github-token: ${{ secrets.PUBLIC_UI_PROJECT_TOKEN }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}