Add tests for docker build

[rajdip-b]

Description

Whenever changes occur to any of the docker files, we want a CI to run to evaluate the validity of these changes. Right now, we have just 2 docker files:

• apps/web/Dockerfile
• apps/api/Dockerfile

Solution

• The CI should run when:
  1. Changes occur to any of the docker file
  2. Changes are made during a push or in a pull request
• Test for build: Issue a docker build command, then check if the image was built successfully