Add format dryrun

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

Author: peterzhuamazon

.github/workflows/build.yml

@@ -18,6 +18,8 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install dependencies and build the code
-        run: |
-          npm install
-          npm run build
+        run: npm install
+      - name: Verify styling
+        run: npm run format-dryrun
+      - name: Run build
+        run: npm run build

package.json

@@ -18,6 +18,7 @@
     "start": "npm run build && probot run ./bin/app.js",
     "clean": "rm -rf ./bin/*",
     "format": "prettier --write \"src/**/*.{js,ts}\" \"test/**/*.ts\" \"configs/**/*.{yaml,yml}\"",
+    "format-dryrun": "prettier --check \"src/**/*.{js,ts}\" \"test/**/*.ts\" \"configs/**/*.{yaml,yml}\"",
     "lint": "eslint --fix \"src/**/*.ts\" --ignore-pattern \"**/*.d.ts\"",
     "test": "jest"
   },