Update the Makefile and Workflow File to use .env to store the secrets

[Lucifergene]

As a developer, it is easier to develop if we have a .env file where all the secrets are stored.

• During local development, the .env file is loaded into the Makefile and the envs are used in the commands.

• In CI/CD pipelines, the envs are directly added as secrets in the CI/CD tool used.