ci: check formatting

.github/workflows/ci.yml

@@ -3,6 +3,14 @@ name: CI
 on: [push, pull_request]
 
 jobs:
+  formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+      - run: npm install
+      - run: npm run format:check
+
   test:
     runs-on: ubuntu-latest
     steps:

package.json

@@ -7,6 +7,7 @@
     "start": "hardhat node --export deployment-localhost.json",
     "compile": "hardhat compile",
     "format": "prettier --write contracts/**/*.sol test/**/*.js",
+    "format:check": "prettier --check contracts/**/*.sol test/**/*.js",
     "lint": "solhint contracts/**.sol",
     "deploy": "hardhat deploy"
   },