add auto gen docs action workflow

.github/workflows/docs-on-pr-close.yml

@@ -0,0 +1,41 @@
+name: Update docs (PR merged to main)
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [main]
+
+permissions:
+  contents: write
+
+concurrency:
+  group: update-docs-main
+  cancel-in-progress: false
+
+jobs:
+  generate-and-push:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout main
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          ref: main
+          fetch-depth: 0
+          persist-credentials: true
+
+      - name: Set up Go
+        uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
+        with:
+          go-version: 1.25
+
+      - name: Generate markdown documentation
+        run: make docs
+
+      - name: Commit and push if docs changed
+        uses: stefanzweifel/git-auto-commit-action@04702edda442b2e678b25b537cec683a1493fcb9 # v7.1.0
+        with:
+          commit_message: "chore: regenerate CLI documentation"
+          branch: main
+          file_pattern: "docs/*.md"
+          disable_globbing: true