Replace third-party commit action with git CLI commands

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jordanpadams

.github/workflows/postman-collection-docs.yml

@@ -25,7 +25,9 @@ jobs:
         run: python docker/postman/generate_collection_docs.py
 
       - name: Commit generated docs
-        uses: stefanzweifel/git-auto-commit-action@v5
-        with:
-          commit_message: 'docs: regenerate postman_collection.md [skip ci]'
-          file_pattern: 'docker/postman/postman_collection.md'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add docker/postman/postman_collection.md
+          git diff --cached --quiet || git commit -m "docs: regenerate postman_collection.md [skip ci]"
+          git push