fix(Docker): add latest tag support for versioned releases

[meteyou]

Description

This PR fix the missing latest tag for Docker images.

Related Tickets & Documents

• fixes Docker image tags does not get updated since v2.14.0 #2362

Mobile & Desktop Screenshots/Recordings

none

[optional] Are there any post-deployment tasks we need to perform?

none

[Copilot]

Pull request overview

This PR adds the latest tag to Docker images when versioned releases (tags starting with v) are published, addressing issue #2362. The implementation uses the docker/metadata-action's conditional tag feature to ensure only versioned releases receive the latest tag, while develop branch builds do not.

• Adds conditional latest tag support using type=raw with an enable condition
• Applies to both the standard and unprivileged Docker image variants via YAML anchor reuse

[springhack]

Seem not work, only edge and sha tags available, even without the version tags:

Log from v2.17.0 build

Run docker/metadata-action@v5
  with:
    images: ghcr.io/mainsail-crew/mainsail
    tags: type=edge,branch=develop
  type=semver,pattern=v{{major}}
  type=semver,pattern=v{{major}}.{{minor}}
  type=semver,pattern=v{{major}}.{{minor}}.{{patch}}
  type=sha
  type=raw,value=latest,enable=false
  
    context: workflow
    github-token: ***
  env:
    REGISTRY: ghcr.io
    IMAGE_NAME: mainsail-crew/mainsail
Context info
Processing images input
Processing tags input
  type=semver,pattern=v{{major}},value=,match=,enable=true,priority=900
  type=semver,pattern=v{{major}}.{{minor}},value=,match=,enable=true,priority=900
  type=semver,pattern=v{{major}}.{{minor}}.{{patch}},value=,match=,enable=true,priority=900
  type=edge,branch=develop,enable=true,priority=700
  type=raw,value=latest,enable=false,priority=200
  type=sha,prefix=sha-,format=short,enable=true,priority=100
Processing flavor input
Docker image version
Docker tags
  ghcr.io/mainsail-crew/mainsail:edge
  ghcr.io/mainsail-crew/mainsail:sha-3783e07