Add missing migration files for PRs #1153 and #1154 and remove Node.js 18 from CI templates

[Copilot]

This PR adds the missing migration documentation files for two recently merged PRs that made significant changes affecting adapter migration behavior, and completes the Node.js 18 removal by updating CI templates.

Background

PRs #1153 and #1154 introduced important changes to the adapter creator:

• PR Fix outdated jsonConfig schema URL in VSCode settings template #1153: Fixed outdated jsonConfig schema URL in VSCode settings template
• PR Remove Node.js 18 support from adapter creator #1154: Removed Node.js 18 support from adapter creator

However, these PRs did not include the required migration documentation files in docs/updates/ that help users understand and apply these changes when migrating existing adapters. Additionally, the GitHub CI workflow templates still referenced Node.js 18.x.

Changes Made

1. Added 20250831_jsonconfig_schema_url_fix.md

Documents the jsonConfig schema URL change from the deprecated location in adapter-react-v5 to the official location in ioBroker.admin:

• Old URL: https://raw.githubusercontent.com/ioBroker/adapter-react-v5/main/schemas/jsonConfig.json
• New URL: https://raw.githubusercontent.com/ioBroker/ioBroker.admin/master/packages/jsonConfig/schemas/jsonConfig.json

Provides step-by-step instructions for updating .vscode/settings.json in existing adapters to use the correct schema for better IntelliSense and validation.

2. Added 20250831_remove_nodejs18_support.md

Documents the removal of Node.js 18 support and explains the automatic migration behavior:

• Node.js 18 is no longer offered as an option for new adapters
• Existing adapters using Node.js 18 are automatically upgraded to Node.js 20 during migration
• Provides comprehensive manual migration steps for existing adapters including:
  • Updating package.json engines field
  • Updating Node.js type definitions
  • Updating TypeScript configuration base
  • Updating GitHub Actions workflows

3. Removed Node.js 18.x from GitHub CI Templates

Completed the Node.js 18 removal by removing 18.x from the adapterTestVersions array in the GitHub workflow template (templates/_github/workflows/test-and-release.yml.ts). This ensures newly created adapters will only test against Node.js 20.x and 22.x versions, fully aligning with the Node.js 18 support removal.

Migration Documentation Format

All files follow the established conventions:

• Date-based filename format (YYYYMMDD_description.md)
• Clear markdown structure with sections for "What changed", "How to update", and "Benefits"
• Code examples with diff syntax for easy copying
• Comprehensive step-by-step instructions

Verification

• All existing tests continue to pass (101/101)
• Migration files are properly formatted and accessible
• Documentation is consistent with existing migration files in the repository
• GitHub workflow templates updated to reflect Node.js 18 removal

Fixes #1156.

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[Apollon77]

@copilot Please do one additional change that was ,issed in the Node.js 18 removal PR: Please also remove 18.x from the Github CI template workflows

[Copilot]

@copilot Please do one additional change that was ,issed in the Node.js 18 removal PR: Please also remove 18.x from the Github CI template workflows

Done! Removed 18.x from the GitHub CI template workflows in commit b498c22. This completes the Node.js 18 removal by ensuring that newly created adapters will only test against Node.js 20.x and 22.x versions.