chore: remove container runner and game server guides

[NathanFlurry]

Removes the container-runner crate and its examples, the Containers, Unity, and Godot integration docs, and the container-runner build, publish, and ignore-file wiring.

Website counterpart: https://github.com/rivet-dev/website/pull/new/remove-container-runner

[railway-app]

🚅 Deployed to the rivet-pr-5846 environment in rivet-frontend

Service	Status	Web	Updated
website	❌ Build Failed (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC
kitchen-sink	🕒 Building (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC
frontend-inspector	🕒 Building (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC
frontend-cloud	🕒 Building (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC
ladle	🕐 Initializing (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC
mcp-hub	🕐 Initializing (View Logs)	Web	Oct 6, 2026 at 9:23 pm UTC

[claude]

Review

This is a pure removal of the container-runner crate, its examples, and the build, publish and ignore wiring.

• I found no leftover references to container-runner or container_runner in the workflows, scripts, docs or website directories. The needs: chains in publish.yaml still point at jobs that exist.
• Cargo.toml and Cargo.lock both drop the crate, and no other workspace member depends on it.
• The PR body says the Containers, Unity and Godot docs are removed, but no docs files appear in the file list. If they live in the separate website repo, merge that PR together with this one so the sidebar and sitemap don't link to deleted pages.
• Removing the Unity example also drops the vendored third-party Bayou/FishNet files and their LICENSE, which is fine for a removal.
• I only had a shallow checkout and couldn't diff publish.yaml, so I didn't check the 2 added lines in that file. Please confirm they only rewire the dependencies of the removed job, for example the needs list of the release job.
• If the container-runner image or crate was published anywhere (Docker registry, crates.io), consider noting its deprecation for existing users.

No bugs or security concerns from what I could check. LGTM once the website counterpart is coordinated.

🤖 Generated with Claude Code

[the-company-company]

✅ No issues found

_{Reviewed commit fd41b9e.}