add github workflow for vale

.github/workflows/vale.yml

@@ -0,0 +1,35 @@
+name: Vale Docs
+on: 
+  pull_request:
+    paths:
+      - 'docs/**'
+      - .github/workflows/vale.yml
+  push:
+    branches:
+      - master
+      - docs-prod
+    paths:
+      - 'docs/**'
+      - .github/workflows/vale.yml
+
+concurrency:
+  group: ${{ github.workflow}}-${{github.ref}}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  vale:
+    name: runner / vale
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: errata-ai/vale-action@reviewdog
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: '["docs/content", "docs/sphinx"]'
+          vale_flags: "--config=docs/.vale.ini"
+          fail_on_error: true
+

docs/Makefile

@@ -1,4 +1,4 @@
-.PHONY: help
+.PHONY: help vale
 
 help:
 	@egrep -h '\s##\s' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m  %-30s\033[0m %s\n", $$1, $$2}'
@@ -27,3 +27,6 @@ mdx-format:  ## Format mdx files
 	cd next; yarn mdx-format
 
 mdx-full-format: docs_ruff mdx-format
+
+vale:
+	vale content sphinx