Add azure deployment preflight skill

[tmeschter]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, or chat mode file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

Add a new skill that performs preflight validation of Azure deployments.

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• New collection file.
• New skill file.
• Update to existing instruction, prompt, chat mode, collection or skill.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

This pull request adds a new Azure Deployment Preflight skill that validates Bicep deployments before execution. The skill provides comprehensive preflight checks including template syntax validation, what-if analysis, and permission verification for both Azure CLI and Azure Developer CLI workflows.

Changes:

• Adds azure-deployment-preflight skill with validation workflow instructions
• Provides reference documentation for validation commands, error handling, and report generation
• Updates skills documentation table to include the new skill

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
skills/azure-deployment-preflight/SKILL.md	Main skill definition with front matter, workflow steps, and usage guidance
skills/azure-deployment-preflight/references/VALIDATION-COMMANDS.md	Comprehensive reference for Azure CLI, azd, and Bicep validation commands
skills/azure-deployment-preflight/references/REPORT-TEMPLATE.md	Template structure and formatting guidelines for preflight validation reports
skills/azure-deployment-preflight/references/ERROR-HANDLING.md	Error handling strategies and fallback approaches for various failure scenarios
docs/README.skills.md	Updated skills table to include the new azure-deployment-preflight skill