Fix Dockerfile build by including Directory.Packages.props

[Copilot]

The Dockerfile build was failing because Directory.Packages.props wasn't copied before dotnet restore. The project uses Central Package Management, which requires this file to resolve package versions.

Changes

• Added COPY ["Directory.Packages.props", "./"] before copying .csproj files in the Dockerfile

This ensures NuGet can locate centrally-managed package versions during the restore phase, eliminating version resolution errors like:

error CS1705: Assembly 'Microsoft.EntityFrameworkCore.Relational' with identity 'Version=1.0.1.0' 
uses 'Microsoft.EntityFrameworkCore, Version=1.0.1.0' which has a higher version than 
referenced assembly 'Microsoft.EntityFrameworkCore' with identity 'Version=1.0.0.0'

Original prompt

Seems like we broke the dockerfile build, did we miss to add the .props file?

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Pull Request Overview

This PR fixes the Dockerfile build failure caused by missing Central Package Management configuration. The project uses Directory.Packages.props to centrally manage NuGet package versions, which must be present during the restore phase.

• Added Directory.Packages.props copy statement before copying .csproj files to ensure NuGet can resolve centrally-managed package versions during dotnet restore