[ci] Route Maven traffic through dotnet-public-maven

[jonathanpeppers]

Summary

• route Binderator Maven Central requests through dotnet-public-maven when RUNNINGONCI=true, while preserving local repository behavior
• route all four Gradle extension builds through the mirror in CI
• update Xamarin.Build.Download network tests to use the anonymously cached Gson 2.11.0 mirror artifact instead of public Maven endpoints
• add an authenticated, token-safe helper for seeding future Gradle dependency graphs or explicit Maven coordinates

Validation

• focused Binderator mirror-routing tests passed
• focused Xamarin.Build.Download Maven-related tests passed
• all four Gradle roots passed gradlew help with RUNNINGONCI=true
• pipeline YAML and mirror PowerShell syntax validated
• git diff --check passed
• all 126 configured Maven Central POMs, Android Gradle Plugin 8.12.0, and the four extension root POMs return HTTP 200 anonymously from dotnet-public-maven

No current Maven artifacts require one-time seeding.

[Copilot]

Pull request overview

This PR updates the repo’s CI behavior to route Maven/Gradle dependency resolution through the dotnet-public-maven Azure Artifacts mirror when RUNNINGONCI=true, while keeping local developer builds using the standard public repositories. It also updates tests and adds tooling to help seed/cached-mirror new artifacts safely.

Changes:

• Add Binderator-side Maven Central resolution logic that swaps Maven Central → dotnet-public-maven only when running on CI, plus targeted unit coverage.
• Route all four Gradle extension roots through the mirror in CI via RUNNINGONCI.
• Update Xamarin.Build.Download network-related tests to use a mirrored Gson 2.11.0 artifact and add a PowerShell helper to seed mirror artifacts.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
util/Xamarin.Build.Download/source/Xamarin.Build.Download.Tests/Test.cs	Switch Maven endpoints used by tests to a mirrored Gson artifact; adjust unsafe URL tests to use example.com.
util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator.csproj	Expose Binderator internals to the test assembly.
util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator/MavenRepositoryResolver.cs	New helper to resolve Maven Central to the mirror only on CI.
util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator/MavenFactory2.cs	Route repository selection through MavenRepositoryResolver.
util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator/MavenFactory.cs	Route repository selection through MavenRepositoryResolver.
util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator.Tests/GenerationTests.cs	Add unit test verifying mirror routing behavior only for CI + Maven Central.
source/com.google.android.play/feature.delivery.extensions/build.gradle	Use the mirror repository when RUNNINGONCI=true, otherwise use google() + mavenCentral().
source/com.google.android.play/core.extensions/build.gradle	Same mirror routing logic for CI.
source/com.google.android.play/asset.delivery.extensions/build.gradle	Same mirror routing logic for CI.
source/com.google.android.material/material.extensions/build.gradle	Same mirror routing logic for CI.
build/gradle/mirror-dependencies.ps1	Add token-safe helper to seed/cache mirror artifacts via authenticated requests.
build/ci/build-and-test.yml	Set RUNNINGONCI=true for the main build step to enable mirror routing.

Suppressed comments (5)

util/Xamarin.Build.Download/source/Xamarin.Build.Download.Tests/Test.cs:537

• This test now deduplicates the Gson mirror URL, but both items are still named FacebookAndroid-4.17.0, which is confusing and makes future failures harder to interpret. Rename both item IDs to reflect the mirrored Gson artifact.

			var itemUrl = DotNetPublicMavenGson;

source/com.google.android.play/feature.delivery.extensions/build.gradle:24

• System.getenv('RUNNINGONCI') == 'true' is case-sensitive; use a null-safe, case-insensitive check so CI mirror routing isn’t dependent on the exact casing of the environment variable.

        if (System.getenv('RUNNINGONCI') == 'true') {

source/com.google.android.play/core.extensions/build.gradle:24

• System.getenv('RUNNINGONCI') == 'true' is case-sensitive; use a case-insensitive check so mirror routing is reliable across CI environments.

        if (System.getenv('RUNNINGONCI') == 'true') {

source/com.google.android.play/asset.delivery.extensions/build.gradle:27

• This RUNNINGONCI check is case-sensitive (== 'true'). Use a null-safe, case-insensitive comparison to avoid skipping mirror routing due to env var casing.

                name = 'dotnet-public-maven'

source/com.google.android.material/material.extensions/build.gradle:24

• System.getenv('RUNNINGONCI') == 'true' is case-sensitive; use a null-safe, case-insensitive check for consistent CI behavior.

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[jonathanpeppers]

Fixed in 17cfaf7: the remaining item IDs now use Gson-2.11.0.

[jonathanpeppers]

Fixed in 17cfaf7 with a null-safe, case-insensitive equalsIgnoreCase check in all Gradle roots.

[jonathanpeppers]

Fixed in 17cfaf7 with a null-safe, case-insensitive equalsIgnoreCase check in all Gradle roots.