Update build.yml

.github/workflows/build.yml

@@ -3,7 +3,7 @@
 # certain platforms or Java versions, and provides a first line of defence
 # against bad commits.
 
-name: build
+name: datagen and build
 on: [pull_request, push]
 
 jobs:
@@ -27,6 +27,8 @@ jobs:
           distribution: 'microsoft'
       - name: make gradle wrapper executable
         run: chmod +x ./gradlew
+      - name: datagen
+        run: ./gradlew runDatagen
       - name: build
         run: ./gradlew build
       - name: capture build artifacts