feat: docker build and push script 작성

Dockerfile

@@ -1,11 +1,11 @@
 # Start with a base image containing Java runtime.
-FROM openjdk:17
+FROM openjdk:17-jdk
 
 # The application's jar file.
-ARG JAR_FILE= build/libs
+ARG JAR_FILE=build/libs/gitget-0.0.1-SNAPSHOT.jar
 
 # Add the application's jar to the container.
-ADD ${JAR_FILE}/gitget-0.0.1-SNAPSHOT.jar app.jar
+COPY ${JAR_FILE} app.jar
 
 # Run the jar file.
-ENTRYPOINT ["java", "-jar", "app.jar"]
+CMD ["java", "-jar", "app.jar"]