chore: add linting and build steps to GitHub Actions workflow

Author: gabriel-logan

.github/workflows/typescript-pr-check.yml

@@ -23,5 +23,9 @@ jobs:
 
       - name: Install dependencies
         run: yarn install
+      - name: Run lint
+        run: yarn lint
       - name: Run tests
         run: yarn pr-check
+      - name: Run build
+        run: yarn build