Docker File:

For a docker build, we need to have a docker file created. The docker file contents is as below - 

FROM maven:latest
RUN mkdir -p /usr/local/maven && mkdir -p /root/.m2 && mkdir /root/.m2/repository
# Copy maven settings, containing repository configurations
COPY settings.xml /root/.m2
WORKDIR /usr/local/maven
ADD ./maven-example .
RUN mvn clean install
RUN mvn clean deploy

The docker file is actually performing the below items - 

1. Pull a maven image
2. Create directories as “/usr/local/maven” and “/root/.m2” and “/root/.m2/repository”
3. Copy the “settings.xml” to the “/root/.m2” directory.
4. Declare “/usr/local/maven” as the working directory.
5. Copy the entire “maven-example” folder along with its content from the GitLab repository to the defined working directory.
6. Run the command “mvn clean install”
7. Run the command “mvn clean deploy”