remove extra build step

Author: danthe1st

.github/workflows/build.yml

@@ -34,8 +34,6 @@ jobs:
           distribution: 'temurin'
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
-      - name: Build with Gradle
-        run: ./gradlew build
       - name: Build JAR
         run: ./gradlew shadowJar
       - name: Build Docker image
@@ -59,4 +57,4 @@ jobs:
         run: docker push --all-tags ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKERHUB_REPONAME }}
         env:
           dockerhub_username: ${{ secrets.DOCKERHUB_USERNAME }}
-        if: env.dockerhub_username != null
+        if: env.dockerhub_username != null