explicit permissions for release-drafter integration (#40)

Explicit RW permissions for content and pull requests required, due to
repository settings, which grants to workflows only read permissions in
the repository for the contents and packages scopes.

- RW for content is required for release draft creation
(release-drafter).
- RW for pull-requests is required for adding labels to PRs
(auto-labeler).

Signed-off-by: Artem Bortnikov <artem.bortnikov@telekom.com>

.github/workflows/release-drafter.yml

@@ -6,6 +6,10 @@ on:
     branches:
       - main
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   update_release_draft:
     runs-on: ubuntu-latest