feat: update platform plugin to 0.3.0

[lusu007]

Description

Updates the bundled plugin-grounds-platform release used by the Paper images from 0.2.1 to 0.3.0.

This applies to:

• paper/Dockerfile
• paper-gamemode/Dockerfile

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 💥 Breaking change
• ♻️ Refactoring
• 📚 Documentation
• 🔧 Chore

Related Issues

• Relates to distributing the latest platform plugin release.

Testing

• Unit tests pass
• Manual testing completed
• New tests added for new functionality

Commands run:

• gh release list --repo groundsgg/plugin-grounds-platform --limit 10
• gh release view v0.3.0 --repo groundsgg/plugin-grounds-platform --json tagName,assets,url,isDraft,isPrerelease,publishedAt
• curl -fsSL --range 0-0 -o /tmp/plugin-platform-v0.3.0-byte https://github.com/groundsgg/plugin-grounds-platform/releases/download/v0.3.0/plugin-grounds-platform-0.3.0-all.jar
• docker build --check -f paper/Dockerfile .
• docker build --check -f paper-gamemode/Dockerfile .

Full Docker builds were attempted with the required BuildKit secret, but the available local GitHub token was rejected by GitHub Packages for existing private runtime/agones dependencies before the build could complete.

Checklist

• I have performed a self-review of my own code
• Tests have been added/updated and pass (if needed)
• Documentation has been updated (if needed)

[Copilot]

Pull request overview

Updates the bundled plugin-grounds-platform version used by the Paper-based images, ensuring newly built paper and paper-gamemode containers download release v0.3.0 of the platform plugin from GitHub Releases.

Changes:

• Bump GROUNDS_PLATFORM_PLUGIN_VERSION from 0.2.1 to 0.3.0 in paper/Dockerfile.
• Bump GROUNDS_PLATFORM_PLUGIN_VERSION from 0.2.1 to 0.3.0 in paper-gamemode/Dockerfile.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
paper/Dockerfile	Updates the platform plugin version argument used to construct the GitHub Releases download URL.
paper-gamemode/Dockerfile	Updates the platform plugin version argument used to construct the GitHub Releases download URL.

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