Update Dockerfile for API App for deployment

[azharem]

As a DevOps engineer I want to update API project Dockerfile to build Jar file within Docker build project so that docker image can be automatically built.

I know this is done when:

• Maven based build is performed within docker build process and clean up is done afterwards.
• The image is automatically built without any intermediate manual step.
• README is update as needed.

[azharem]

As a DevOps engineer I want to update API project Dockerfile to build Jar file within Docker build project so that docker image can be automatically built.

I know this is done when:

• Maven based build is performed within docker build process and clean up is done afterwards.
• The image is automatically built without any intermediate manual step.
• README is update as needed.