Add .devskim configuration file for code scanning

[clairernovotny]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a DevSkim configuration file to enable code scanning for security vulnerabilities. DevSkim is a security-focused linting tool that helps identify potential security issues in code.

• Adds a new .devskim configuration file in the .github/workflows/ directory
• Configures file and directory exclusions for the security scanning tool
• Excludes common non-source directories like .git, bin, obj, and the nuget.config file

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[Copilot]

JSON does not support comments. This comment will cause the configuration to be invalid JSON and may prevent DevSkim from parsing the file correctly. Remove the comment or use a JSON5-compatible format if supported.

Suggested change

	"**/nuget.config" // exact file at repo root
	"**/nuget.config"