Cleanup github actions

.github/workflows/docs.yaml

@@ -0,0 +1,48 @@
+name: Documentation
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+
+  changes:
+    runs-on: ubuntu-latest
+    if: |
+      (github.repository == 'kubernetes/ingress-nginx')
+    outputs:
+      docs: ${{ steps.filter.outputs.docs }}
+      charts: ${{ steps.filter.outputs.charts }}
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - uses: dorny/paths-filter@v2.2.0
+        id: filter
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          filters: |
+            docs:
+              - 'docs/**/*'
+
+  docs:
+    name: Update
+    runs-on: ubuntu-latest
+    needs:
+      - changes
+    if: |
+      (github.repository == 'kubernetes/ingress-nginx') &&
+      (needs.changes.outputs.docs == 'true')
+
+    steps:
+
+      - name: Checkout master
+        uses: actions/checkout@v1
+
+      - name: Deploy
+        uses: ./.github/actions/mkdocs
+        env:
+          PERSONAL_TOKEN: ${{ secrets.PERSONAL_TOKEN }}