Update ci.yml

Author: gnbm

.github/workflows/ci.yml

@@ -18,6 +18,8 @@ jobs:
           cache: 'npm'
       - name: Install
         run: npm ci
+      - name: Build (generate testing artifacts)
+        run: npm run build -- --ci
       - name: Run Jest (core)
         run: npm run test.jest
 
@@ -35,5 +37,7 @@ jobs:
           cache: 'npm'
       - name: Install
         run: npm ci
+      - name: Build bundler artifacts
+        run: npm run --prefix test/bundler build
       - name: Run Bundler tests
         run: npm run test.bundler