Add prerelease and snapshot tag support to CI orb

[kirgene]

Goal

As a Mojaloop developer
I want to CI to support prerelease and snapshot Docker image tags
so that in-progress work can be tested with versioned images before official release

Description

Implementation

• Support snapshot tags (e.g. v3.8.0-snapshot.23) for development builds
• Support prerelease tags for release candidates
• Publish to Docker Hub with appropriate tag metadata
• Integrate with existing mojaloop CI orb release flow

Complexity: Low-Medium