Add check-readme-cli-help and test in CI.

Author: lgarron

.github/workflows/test.yml

@@ -13,3 +13,4 @@ jobs:
         run: env HOMEBREW_NO_AUTO_UPDATE=1 brew install imagemagick
       - name: make test
         run: make test
+      - run: make check-readme-cli-help

Makefile

@@ -33,3 +33,8 @@ clean:
 .PHONY: readme-cli-help
 readme-cli-help:
 	bun x readme-cli-help "cargo run -- --help"
+
+
+.PHONY: check-readme-cli-help
+check-readme-cli-help:
+	bun x readme-cli-help --check-only "cargo run -- --help"