workflows: add a check to update cli commands docs when changes occur

Signed-off-by: Andrey Butusov <andrey@nspcc.io>

.github/workflows/cli-docs-update.yml

@@ -0,0 +1,30 @@
+name: CLI commands docs check
+
+on:
+  pull_request:
+    branches:
+      - master
+      - support/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: cli-docs-check
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get current CLI doc files
+        id: current-docs-diff
+        uses: tj-actions/changed-files@v42
+        with:
+          files: docs/cli-commands/**
+
+      - name: Generate new CLI doc files
+        run: make gendoc
+
+      - name: Check if CLI docs are up-to-date
+        if: steps.current-docs-diff.outputs.has_changed == 'true'
+        run: |
+          git diff --exit-code docs/cli-commands || (echo 'CLI documentation has not been updated' && exit 1)