This line specifies the base image for the Docker image.

In this case, it's using a Maven image with version 3.9.6,

which also includes Amazon Corretto

(a distribution of the Open Java Development Kit) version 17.

This base image comes with Maven and Java pre-installed.

FROM maven:3.9.6-amazoncorretto-17-al2023

Sets the working directory for the Docker image.

WORKDIR /app

Copies the pom.xml file and the mvnw and mvnw.cmd files

mvnw and mvnw.cmd are Maven wrapper files that allow you to run Maven

without having to install Maven on your local machine.

mvnw is for Unix based systems and mvnw.cmd is for Windows.

COPY mvnw mvnw.cmd pom.xml ./

Copies the src directory from local to ./src in the Docker container.

COPY src ./src

Runs the Maven command to build the application

and cleans the build directory before packaging the application

RUN mvn clean package -DskipTests=true

Execute the application when the Docker container runs

CMD ["mvn", "spring-boot:run"]