[workflows] Fix permissions check for creating new releases (#81163)

The default GitHub token does not have read permissions on the org, so
we need to use a custom token in order to read the members of the
llvm-release-managers team.

(cherry picked from commit 2836d8e)

Author: tstellar

.github/workflows/release-tasks.yml

@@ -28,6 +28,7 @@ jobs:
     name: Create a New Release
     runs-on: ubuntu-latest
     needs: validate-tag
+
     steps:
       - name: Install Dependencies
         run: |
@@ -40,8 +41,9 @@ jobs:
       - name: Create Release
         env:
           GITHUB_TOKEN: ${{ github.token }}
+          USER_TOKEN: ${{ secrets.RELEASE_TASKS_USER_TOKEN }}
         run: |
-          ./llvm/utils/release/./github-upload-release.py --token "$GITHUB_TOKEN" --release ${{ needs.validate-tag.outputs.release-version }} --user ${{ github.actor }} create
+          ./llvm/utils/release/./github-upload-release.py --token "$GITHUB_TOKEN" --release ${{ needs.validate-tag.outputs.release-version }} --user ${{ github.actor }} --user-token "$USER_TOKEN" create
   release-documentation:
     name: Build and Upload Release Documentation
     needs:

llvm/utils/release/github-upload-release.py

@@ -77,20 +77,28 @@ def upload_files(repo, release, files):
 parser.add_argument("--token", type=str)
 parser.add_argument("--release", type=str)
 parser.add_argument("--user", type=str)
+parser.add_argument("--user-token", type=str)
 
 # Upload args
 parser.add_argument("--files", nargs="+", type=str)
 
 args = parser.parse_args()
 
-github = github.Github(args.token)
-llvm_org = github.get_organization("llvm")
+gh = github.Github(args.token)
+llvm_org = gh.get_organization("llvm")
 llvm_repo = llvm_org.get_repo("llvm-project")
 
 if args.user:
+    if not args.user_token:
+        print("--user-token option required when --user is used")
+        sys.exit(1)
     # Validate that this user is allowed to modify releases.
-    user = github.get_user(args.user)
-    team = llvm_org.get_team_by_slug("llvm-release-managers")
+    user = gh.get_user(args.user)
+    team = (
+        github.Github(args.user_token)
+        .get_organization("llvm")
+        .get_team_by_slug("llvm-release-managers")
+    )
     if not team.has_in_members(user):
         print("User {} is not a allowed to modify releases".format(args.user))
         sys.exit(1)