feat: Add ability to get latest prod deployment

[fztgreen-veteransunited]

What this PR is for

This PR adds support for retrieving the latest successful deployment for a project environment.

---

Get Latest Deployment

Usage:

miactl deploy latest [flags]

Flags:

    --environment string   the environment scope for the command
-h, --help                 help for latest
    --project-id string    the ID of the project

Description:

This command fetches the most recent successful deployment for a specified project and environment. It returns deployment details including:

• Deployment ID
• Git reference (branch/tag)
• Pipeline ID
• Deployment status
• Completion timestamp
• Environment information

Example:

miactl deploy latest --project-id my-project --environment production

Output:

Latest deployment for environment production:
ID: deploy-123
Ref: main
Status: success
Finished At: 2026-01-13 14:30:00 +0000 UTC

---

Technical Changes:

• Added new latest subcommand under deploy
• Created DeploymentHistory and EnvironmentInfo resource types
• Added support for querying deployment history API endpoint
• Includes comprehensive unit tests

[ThisIsDemetrio]

Hi @fztgreen-veteransunited . That's a great addition, thanks for the time you dedicated.

However, I'd suggest to include this new command under ['miactl deploycommand](https://github.com/mia-platform/miactl/blob/main/internal/cmd/deploy/deploy.go), which groups commands dedicated to deployments, instead ofmiactl runtime` which is dedicated to the resources active in the cluster.

You might have missed that as deploy is not in the miactl --help menu, because it use to be a command and not a group of commands. We are working on it to remove the depreaction before the next miactl release.

Thanks again. We will approve this PR once this update is performed.

[ThisIsDemetrio]

Another request, is to update the CHANGELOG.md file, under the ### Added section on top.

[ThisIsDemetrio]

Thanks for implementing this feature. Before the approval, we prefer to discuss and solve the comments above.

[fztgreen-veteransunited]

@ThisIsDemetrio I made the requested changes. Please let me know if there are any other concerns. Thank you!

[ThisIsDemetrio]

Thanks for sending this pull request. It looks fine, so it is going to be merged soon.