ci: update helm-docs in pull requests

.github/workflows/helm-docs.yml

@@ -0,0 +1,26 @@
+name: Update helm-docs
+
+on: pull_request
+
+env:
+  HELM_DOCS_VERSION: "1.11.0"
+
+jobs:
+  helm-docs:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - name: Install binaries
+      run: |
+        mkdir -p $GITHUB_WORKSPACE/bin
+        echo "$GITHUB_WORKSPACE/bin" >> $GITHUB_PATH
+        curl -sSL https://github.com/norwoodj/helm-docs/releases/download/v${{env.HELM_DOCS_VERSION}}/helm-docs_${{env.HELM_DOCS_VERSION}}_Linux_x86_64.tar.gz | tar xvfz - --overwrite -C $GITHUB_WORKSPACE/bin
+
+    - run: helm-docs
+
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        file_pattern: 'charts/**/README.md'
+        commit_message: 'docs: update helm-docs'