feat: add info on how to check for changes in docs

README.md

@@ -30,7 +30,17 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+
+      - name: Check for changes
+        uses: dorny/paths-filter@v2
+        id: changes
+        with:
+          filters: |
+            src:
+              - './docs/**'
+
       - name: Build
+        if: steps.changes.outputs.src == 'true'
         uses: diplodoc-platform/docs-build-action@v3
         with:
           revision: "pr-${{ github.event.pull_request.number }}"