ci: FORMS-1681 fix production url in push action

[WalterMoar]

Description

The on_push Action displays the URL of the deployed environment for dev, test, and production. However, we use the vanity URL submit.digital.gov.bc.ca, which is not what is displayed in the Action:

Acceptance Criteria

• The URL in the production deployment is the proper URL of the app.

Type of Change

ci (change in continuous integration / deployment)

Checklist

• I have read the CONTRIBUTING doc
• I have checked that unit tests pass locally with my changes
• I have run the npm script lint on the frontend and backend
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have approval from the product owner for the contribution in this pull request