ci(docs): add job to verify generated docs in readme are up to date

.github/workflows/ci.yml

@@ -1,13 +1,23 @@
 ---
 name: Release
-on:
-  push:
-    branches:
-      - main
+on: push
 
 jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+      - run: make docs
+      - name: Verify no changes after docs build
+        run: |
+          git diff --exit-code
+
   release-please:
     runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
     steps:
       - uses: jimeh/release-please-manifest-action@v1
         id: release

Makefile

@@ -1,3 +1,10 @@
+.PHONY: docs
+docs: readme
+
+.PHONY: readme
+readme: check-npx action-docs
+	npx --yes prettier --print-width 80 --prose-wrap always --write README.md
+
 .PHONY: action-docs
 action-docs: check-npx
 	npx --yes action-docs --update-readme