fix(renovate): drop a custom manager that matches nothing

[Mtze]

What and why

Correcting a mistake I shipped in #4.

The preset included a regex custom manager for deployments/*/values.yaml in EduIDE-deployment, reading the student IDE images listed under preloading.images:. I verified that regex against the real file and it matched 12 production images, so I described it in #4 as the highest-value gap the config closed.

That verification was run against a stale local checkout. EduIDE-deployment #111/#113 landed the day before and replaced the entire layout: deployments/<fqdn>/values.yaml became environments/<short-name>/{env.yaml,values.yaml}, and preloading.images was removed outright - images are now derived from the chart's appDefinitions. A grep for preloading on that repo's main hits only AGENTS.md and docs/environments.md, both saying not to list images.

So on main the manager matches zero files and the deployments/** package rule matches zero dependencies. Nothing breaks, but it is config asserting coverage it does not provide, which is worse than having none - it is the kind of thing someone later reads as "deployment images are handled".

This removes both.

EduIDE-deployment #116 already added the right replacement in that repo's own renovate.json: a regex manager for spec.platform.chartVersion in environments/*/env.yaml, verified to match all 8 environment manifests. Those files are an eduide.dev/v1 Environment CRD, so no built-in manager can read them, and the file shape is specific enough that the repo is the correct home for it rather than the shared preset.

The theiaPlugins custom manager is untouched and still correct - re-verified against EduIDE's main, it matches eclipse-theia/vscode-builtin-extensions@1.104.0.

How it was verified

• renovate-config-validator --strict renovate-config.json (renovate 44.46.7) - passes.
• git ls-tree -d origin/main on EduIDE-deployment confirms no deployments/ directory: the top level is .github clusters docs environments schemas scripts.
• git grep preloading origin/main on that repo returns only doc hits, no config.
• EduIDE/package.json on main still contains the GitHub release URL the surviving manager targets.

Deployment impact

• None of the above

Risk and rollback

Removing config that matches nothing cannot change any outcome. Rollback is a revert.

The broader lesson is in renovate/README.md now: a regex manager that matches nothing looks identical to one that found nothing to update. Neither logs an error. The only way to tell them apart is --dry-run=full and reading the extraction counts, which is what caught this and what caught the ToolDockerfile pattern in EduIDE (2 files -> 18).

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e814be and 1f75ba0.

📒 Files selected for processing (2)

• renovate-config.json
• renovate/README.md

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