Docker: Create an image with LABEL & ONBUILD instructions

Problem Statement:

Write a Dockerfile that:

• Uses the LABEL instruction to add metadata to the image.
• Uses the ONBUILD instruction to define actions that will be executed when the image is used as a base for another build.
• Verify the labels are correctly added by inspecting the image and testing the ONBUILD instruction by using the image in a subsequent Dockerfile.

Lab Objective:

Upon completion of this lab, you will be able to:

• Use the LABEL instruction in a Dockerfile to add metadata to an image.
• Implement the ONBUILD instruction to define actions for future builds based on the image.
• Verify the application of LABEL and ONBUILD instructions by inspecting the image and testing them in subsequent builds.

Prerequisites

You should install the following software on your machine:

• Docker
• Text Editor
• Terminal/Command Line Interface