Use DinD in Package Job and Create Dockerfile

.gitlab-ci.yml

@@ -28,7 +28,7 @@ package_job:
     stage: package
     image: docker:latest
     services:
-        - docker:bind
+        - docker:dind
     script:
         - echo "Building Docker image..."
         - docker build -t ${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG} .

dockerfile

@@ -0,0 +1,11 @@
+FROM ubuntu:20.04
+
+ENV BUILD_DIR="build"
+ENV APPLICATION_BINARY="Application"
+ENV OPEN_PORT=8080
+
+WORKDIR /app
+COPY ${BUILD_DIR}/${APPLICATION_BINARY} .
+
+EXPOSE ${OPEN_PORT}
+CMD [ "./${APPLICATION_BINARY}" ]