Use readme-generator npm package in generate-readme workflow (#13074)

Signed-off-by: Fran Mulero <fmulero@vmware.com>

.github/workflows/generate-chart-readme.yml

@@ -13,27 +13,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout bitnami-labs/readme-generator-for-helm
-        uses: actions/checkout@v3
-        with:
-          repository: 'bitnami-labs/readme-generator-for-helm'
-          ref: '1af12881436b1f58f0643d733fd5196b4a11caa8'
-          path: readme-generator-for-helm
-
-      - name: Cache node modules
-        uses: actions/cache@v3
-        env:
-          cache-name: cache-node-modules
-        with:
-          # npm cache files are stored in `~/.npm` on Linux/macOS
-          path: ~/.npm
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('readme-generator-for-helm/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-
-      - name: Install readme-generator-for-helm dependencies
-        run: cd readme-generator-for-helm && npm install
-
+      - name: Install readme-generator-for-helm
+        run: npm install -g @bitnami/readme-generator-for-helm@2.4.2
       - name: Checkout bitnami/charts
         uses: actions/checkout@v3
         with:
@@ -52,7 +33,7 @@ jobs:
           charts_dirs_changed="$(echo "$files_changed" | xargs dirname | grep -o "bitnami/[^/]*" | sort | uniq || true)"
           for chart in ${charts_dirs_changed}; do
             echo "Updating README.md for ${chart}"
-            readme-generator-for-helm/bin/index.js --values "charts/${chart}/values.yaml" --readme "charts/${chart}/README.md" --schema "/tmp/schema.json"
+            readme-generator --values "charts/${chart}/values.yaml" --readme "charts/${chart}/README.md" --schema "/tmp/schema.json"
           done
       - name: Push changes
         run: |