Add 5-minute-production-app CI template

What does this MR do?

Adds 5-minute-production-app CI template.

5 minute production app is a new initiative (mine and Sid) to deploy a simple web app in less than 5 minute.

The idea is that you have a web app, Dockerfile and AWS credentials. GitLab will do everything for you. See project readme

1. It uses AWS infra and Terraform to manage it.
2. In future this will be integrated into AutoDevOps but for first iteration it will be a standalone template.
3. Example projects that are using this template can be found at https://gitlab.com/gitlab-org/5-minute-production-app/examples

For more information about feature development see 5 minute production app: Auto Devops Production app with Terraform and Amazon EC2, RDS, S3 in Google Drive

Fixes gitlab-org/5-minute-production-app/deploy-template#39 (closed)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
  • Documentation exists in https://gitlab.com/gitlab-org/5-minute-production-app/deploy-template/-/blob/master/README.md
  • I will add reference from doc.gitlab.com after this MR is merged
• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

1. I added specs for template in this MR
2. We test manually and regularly with next projects https://gitlab.com/gitlab-org/5-minute-production-app/examples
3. We have automated tests in https://gitlab.com/gitlab-org/5-minute-production-app/deploy-template/-/pipelines

Security

Security aspect of this feature was reviewed in https://gitlab.com/gitlab-com/gl-security/appsec/appsec-reviews/-/issues/67