chore(minecraft): bump minecraft to 2026.7.0

[mberlofa]

Closes #698.

Summary

• Bump Minecraft server image from 2026.6.1 to 2026.7.0.
• Update the main image tag, backup worker image, values schema defaults, README upgrade notes, and unit test expectations.
• Keep the metrics sidecar image unchanged; this PR only updates the itzg/minecraft-server image tracked by the upstream-update issue.

Upstream Evidence

• GitHub release: https://github.com/itzg/docker-minecraft-server/releases/tag/2026.7.0
• Docker Hub image manifest verified: docker.io/itzg/minecraft-server:2026.7.0
• Manifest platforms: linux/amd64, linux/arm64.
• 2026.7.0 is a stable, non-prerelease upstream release published on 2026-07-04.
• Release notes include Purpur support for ServerLibraryCleaner, start-utils extraction fixes, GTNH pack version handling with spaces, Paper boolean flag handling, and packwiz env-file reload after installer runs.

Site Sync

• Site PR: docs(minecraft): sync 2026.7.0 default site#379

Validation

• make image-verify IMAGE=docker.io/itzg/minecraft-server:2026.7.0
• make deps-check CHART=minecraft
• helm unittest charts/minecraft passed: 7 suites, 71 tests.
• make standards-check CHART=minecraft
• make validate-chart CHART=minecraft passed fully: 17 layers, including k3d behavioral validation for default and all CI values scenarios.
• make site-sync-check CHART=minecraft
• make release-check REPO=charts
• make attribution-check REPO=charts

Summary by CodeRabbit

• New Features

  • Updated the Minecraft chart to use the latest 2026.7.0 server image by default.
  • Backup-related components now also use the matching newer image version.

• Documentation

  • Refreshed upgrade notes with the latest upstream release highlights and a more detailed upgrade checklist.

• Tests

  • Adjusted chart tests to match the updated default image versions.

[github-actions]

Standards Check (GR-079) — PASS

Every changed chart fully passes standards-check.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b0ef48a7-4d22-4e82-9a7f-33030c22a187

📥 Commits

Reviewing files that changed from the base of the PR and between 66a35d5 and 145d047.

📒 Files selected for processing (6)

• charts/minecraft/Chart.yaml
• charts/minecraft/README.md
• charts/minecraft/tests/backup_test.yaml
• charts/minecraft/tests/deployment_test.yaml
• charts/minecraft/values.schema.json
• charts/minecraft/values.yaml

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📝 Walkthrough

Walkthrough

The minecraft Helm chart's default upstream image tag is bumped from 2026.6.1 to 2026.7.0 across Chart.yaml appVersion/changelog, values.yaml, values.schema.json defaults, README upgrade notes, and unit test expectations for backup and deployment templates.

Changes

Minecraft image version bump to 2026.7.0

Layer / File(s)	Summary
Chart metadata and default values charts/minecraft/Chart.yaml, charts/minecraft/values.yaml, charts/minecraft/values.schema.json	appVersion and ArtifactHub changelog entry updated to 2026.7.0; default image.tag and backup worker image tag updated in values.yaml and matching schema defaults updated in values.schema.json.
README upgrade notes update charts/minecraft/README.md	Upgrade Notes expanded with upstream release highlights and a more detailed staging/validation checklist for the 2026.7.0 bump.
Unit test expectation updates charts/minecraft/tests/backup_test.yaml, charts/minecraft/tests/deployment_test.yaml	Test assertions for pre-backup, archive, and post-backup container images, and the default deployment image tag, updated to expect 2026.7.0.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Related issues: #698 (upstream image update for minecraft chart from 2026.6.1 to 2026.7.0)

Suggested labels: dependencies, minecraft, chore

Suggested reviewers: helm-chart-maintainers

Poem:
A hop, a skip, a version tweak,
From six-point-one to seven we speak.
Chart.yaml hums a newer tune,
Tests and README join the boon.
🐇 Minecraft's rabbit updates the block! 🧱

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the Minecraft chart bump to 2026.7.0.
Linked Issues check	✅ Passed	The PR updates the chart image tag, appVersion, defaults, and tests to 2026.7.0, matching the issue's core requirements.
Out of Scope Changes check	✅ Passed	The README and schema/test updates are support changes for the image bump and stay within the issue scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/minecraft-2026.7.0

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_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

🟢 Security Scan: minecraft

Framework	Score
MITRE + NSA + SOC2	78.78788%

✅ Security posture acceptable.