feat(gha): Help Renovate + Dependabot to update HELM docs (#13366)

Author: kiblik

.github/workflows/helm-docs-updates.yml

@@ -0,0 +1,25 @@
+name: Update HELM docs for Renovate & Dependabot
+
+on:
+  pull_request:
+    branches:
+      - master
+      - dev
+      - bugfix
+      - release/**
+      - hotfix/**
+
+jobs:
+  docs_updates:
+    name: Update documentation
+    runs-on: ubuntu-latest
+    if: startsWith(github.head_ref, 'renovate/') or startsWith(github.head_ref, 'dependabot/')
+    steps:
+      - name: Checkout
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      
+      - name: Run helm-docs
+        uses: losisin/helm-docs-github-action@a57fae5676e4c55a228ea654a1bcaec8dd3cf5b5 # v1.6.2
+        with:
+          chart-search-root: "helm/defectdojo"
+          git-push: true