GitHub Workflows security hardening (#3884)

Signed-off-by: sashashura <[email protected]>

Author: sashashura

.github/workflows/bad-pr.yml

@@ -4,8 +4,13 @@ on:
   pull_request_target:
     types: [opened, reopened]
 
+permissions:
+  contents: read
+
 jobs:
   close-pr:
+    permissions:
+      pull-requests: write
     runs-on: ubuntu-latest
     if: "contains(github.event.pull_request.body, 'by deleting this comment block') || github.event.pull_request.body == ''"
     steps: