diff --git a/.github/workflows/build_and_deploy.yml b/.github/workflows/build_and_deploy.yml
index cf4b1c23..e2969e1d 100644
--- a/.github/workflows/build_and_deploy.yml
+++ b/.github/workflows/build_and_deploy.yml
@@ -20,6 +20,13 @@ jobs:
         shell: bash
         run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF##*/})"
         id: extract_branch
+      - name: Checkout
+        uses: actions/checkout@v2.3.1
+        if: steps.extract_branch.outputs.branch == 'master'
+      - name: Build
+        run: |
+          ./gradlew run
+        if: steps.extract_branch.outputs.branch == 'master'
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@4.1.4
         with: