#168371026 Fix staging deployment

[OlawaleJoseph]

What does this PR do?

Adds Clean script to package.json file
Adds build script to package.json file
Adds heroku-postbuild script to package.json file

Description of Task to be completed?

Make changes to the app to ensure it runs in the staging environment

How should this be manually tested?

Open postman, make a get request to https://firestar-backend-staging-pr-38.herokuapp.com/api/v1/users/email/verify with an email in the request body. An appropriate message will be received

Any background context you want to provide?

N/A

What are the relevant pivotal tracker stories?

#168371026

Screenshots (if appropriate)

Questions:

N/A

[conquext]

Please attach the screenshot of the successful build and migrations in the PR.

[dewaleolaoye]

POST request on https://firestar-backend-staging-pr-38.herokuapp.com/api/v1/auth/login throws
404 error

[conquext]

POST request on https://firestar-backend-staging-pr-38.herokuapp.com/api/v1/auth/login throws
404 error

The ticket for that route is still in review. Have you tried any other route whose ticket is merged to stage?

[dewaleolaoye]

POST request on https://firestar-backend-staging-pr-38.herokuapp.com/api/v1/auth/login throws
404 error

The ticket for that route is still in review. Have you tried any other route whose ticket is merged to stage?

Okay, I use what is on the PR how to manually test