Gom 95 secrets management

[vgnapskainos]

Description

The infrastructure is responsible for:

• Hosting secure secret placeholders in AWS Secrets Manager
• Providing cross-account access for InterSystems (IS) to retrieve secrets
• Enabling secure, GitHub Actions–based infrastructure deployment via OIDC
• Managing Terraform state securely using S3

Context

This IaC introduces new terraform code to deploy the NHS-E secrets management infrastructure. J
Jira: https://nhsd-jira.digital.nhs.uk/browse/GOM-95
Confluence: https://nhsd-confluence.digital.nhs.uk/spaces/APCLAG/pages/1399694385/GOM+%E2%80%93+NHS%E2%80%91E+Infrastructure+Terraform+Secrets+Management

This change establishes a secure approach to secret management for NHS-E GNOMS project. It removes the need of storing the secrets in third party SaaS platform and manually handling, providing real-time cross-account retrieval of secrets without storing externally.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.