fix: map to environment variables instead of directly from inputs

[Jaxelr]

No description provided.

[Copilot]

Pull request overview

This PR refactors the GitHub Action to improve security and maintainability by mapping inputs to environment variables instead of directly interpolating them in the PowerShell script. This approach helps prevent potential injection issues and makes the script more robust.

Key Changes:

• Added INPUT_* environment variable mappings for all action inputs
• Updated PowerShell script to read from environment variables using $env:INPUT_* instead of direct ${{ inputs.* }} interpolation
• Added explicit validation for the required endpoint input

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[Jaxelr]

Tested for functionality using github action sample (this is untrusted by design, since its a test):