Update github workflow > add docker login

Author: SgtSilvio

.github/workflows/gradle.yml .github/workflows/check.yml.github/workflows/gradle.yml renamed to .github/workflows/check.yml

@@ -14,5 +14,10 @@ jobs:
           distribution: temurin
           java-version: 11
           cache: gradle
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_TOKEN }}
       - name: Check
         run: ./gradlew check