[Feature]: Documentation to apply a given PR in certification

[aldbr]

User Story

As a DIRAC developer, I want a documentation page explaining how to install my branch in a test setup, with specific example of the DIRAC certification setup, so that I can test it in real conditions.

Feature Description

NTR

Definition of Done

• How to install a specific DIRAC branch
• How to install a specific Pilot branch
• How to install a specific DIRAC branch within the pilot
• How to install a specific WebApp DIRAC branch
• How to install a specific diracx branch (probably exist, just point to it?)
• How to install a specific diracx-web branch (probably exist, just point to it?)

Alternatives Considered

No response

Related Issues

No response

Additional Context

No response