Add automated tests

[Decipher]

Is your feature request related to a problem? Please describe.
As a maintainer I want automated tests so that I can reduce the risk of the project breaking.
As a user I want an example of automated tests so that I can use them on my own project.

Describe the solution you'd like

• Add Github Actions integration
• Add GitLabCI integration
• Add CircleCI integration
• Add Jobs
  • Build; Ensure frontend and backend code builds successfully
  • Lint:
    • Composer
    • ESLint
    • ...
  • Test:
    • Unit tests
    • Code coverage tests
    • End to end tests

Describe alternatives you've considered
N/A

Additional context

• Tests and integrations should also be implemented on the other quickstart repositories