chore: add Docker pull & run Contents

.github/workflows/gradle.yml

@@ -68,8 +68,11 @@ jobs:
           key: ${{ secrets.PRIVATE_KEY }}
           port: 22
           script: |
-            whoami
-            ls -al
+            sudo docker stop $(sudo docker ps -q) 2>/dev/null || true
+            sudo docker pull ${{ secrets.DOCKER_REPO }}/ustory
+            sudo docker run --name github-actions-demo --rm -d -p 8080:8080 ${{ secrets.DOCKER_REPO }}/ustory
+            sudo docker system prune -f
+
     # NOTE: The Gradle Wrapper is the default and recommended way to run Gradle (https://docs.gradle.org/current/userguide/gradle_wrapper.html).
     # If your project does not have the Gradle Wrapper configured, you can use the following configuration to run Gradle with a specified version.
     #