chore: automatically approve Ben's docs PRs (#6444)

.github/workflows/contrib.yaml

@@ -19,7 +19,7 @@ concurrency: pr-${{ github.ref }}
 
 jobs:
   # Dependabot is annoying, but this makes it a bit less so.
-  auto-approve:
+  auto-approve-dependabot:
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request_target'
     permissions:
@@ -27,6 +27,19 @@ jobs:
     steps:
       - uses: hmarr/auto-approve-action@v3
         if: github.actor == 'dependabot[bot]'
+  auto-approve-docs:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request_target'
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Get changed files in the docs folder
+        id: changed-files
+        uses: tj-actions/changed-files@v35
+        with:
+          files: docs/*
+      - uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'bpmct' && steps.changed-files.outputs.only_changed == 'true'
 
   cla:
     runs-on: ubuntu-latest