Add authenication and nuget feed cofig into yml for fetch and restore…

[v-ochoudhary]

Details

This pull request updates the build pipeline configuration to improve NuGet authentication and package restore reliability. The changes ensure all build jobs use a consistent nuget.config file and explicitly authenticate to the NuGet feeds before restoring packages.

Key changes include:

NuGet Authentication and Restore Improvements:

• Added the NuGetAuthenticate@1 task before all NuGet restore steps across prbuild.yml, signedbuild.yml, and check-dependencies.yml to ensure authenticated access to private feeds. [1] [2] [3] [4] [5] [6]
• Updated all NuGetCommand@2 and DotNetCoreCLI@2 restore tasks to use a centralized NuGet configuration file (src/nuget.config) by setting the feedsToUse: config and nugetConfigPath inputs. This ensures consistent and secure package source usage. [1] [2] [3] [4] [5] [6] [7]

Configuration and Policy Updates:

• Added a new src/nuget.config file specifying the a11y-insights-public package source for all restores.
• Set the networkIsolationPolicy to Permissive,CFSClean in build pipeline templates to align with updated security/networking requirements. [1] [2]

These changes help standardize package management and improve build reliability across all pipelines.…

Motivation

Fix PR checks failed due to nuget package is not restore.

Pull request checklist

• Addresses an existing issue: #0000

[azure-pipelines]

Azure Pipelines:
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[v-ochoudhary]

/azp run

[azure-pipelines]

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[Copilot]

🟡 Changes recommended

Clearing existing sources may prevent required packages from restoring unless the configured feed provides the necessary upstreams.

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Pull request overview

This PR standardizes authenticated NuGet restores across Azure Pipelines.

Changes:

• Adds centralized src/nuget.config.
• Authenticates NuGet feeds before restores.
• Configures restore tasks to use the shared configuration.
• Updates network isolation settings.

File summaries

File	Description
src/nuget.config	Defines the shared package source.
build/signedbuild.yml	Updates authenticated signed-build restores.
build/prbuild.yml	Updates authenticated PR-build restores.
build/check-dependencies.yml	Updates authenticated dependency checks.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 1
• Review effort level: Lite

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