chore: update embeddings db cron to use a bot PAT to be able to commit over branch protections

Author: sp3nx0r

.github/workflows/generate-db.yml

@@ -45,3 +45,10 @@ jobs:
           file_pattern: |
             db/devvit-docs.db
             fixtures/**
+        env:
+          GIT_AUTHOR_NAME: devvit-bot
+          GIT_AUTHOR_EMAIL: devvit-bot@reddit.com
+          GIT_COMMITTER_NAME: devvit-bot
+          GIT_COMMITTER_EMAIL: devvit-bot@reddit.com
+          # Use your PAT instead of GITHUB_TOKEN
+          GITHUB_TOKEN: ${{ secrets.BOT_PAT }}