Add explicit permissions to workflows after org-level read-only default

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

Author: lawofcycles

.github/workflows/add-untriaged.yml

@@ -7,6 +7,8 @@ on:
 jobs:
   apply-label:
     runs-on: ubuntu-latest
+    permissions:
+      issues: write
     steps:
       - uses: actions/github-script@v6
         with:

.github/workflows/delete_backport_branch.yml

@@ -7,6 +7,8 @@ on:
 jobs:
   delete-branch:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     if: startsWith(github.event.pull_request.head.ref,'backport/')
     steps:
       - name: Delete merged branch

.github/workflows/release_drafter.yml

@@ -9,6 +9,9 @@ jobs:
   draft-a-release:
     name: Draft a release
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
     steps:
       - name: Checkout code
         uses: actions/checkout@v3