Fix Postgres health checks with Postgres 18

[PatrickMatthiesen]

Summary

• add an explicit Npgsql dependency to Aspire.Hosting.PostgreSQL
• centrally pin Npgsql to 10.0.2, matching the existing Npgsql.DependencyInjection version
• ensure the built-in Postgres healthcheck no longer resolves to Npgsql 8.0.3 when using the default postgres:18.3 image

Details

Aspire.Hosting.PostgreSQL registers its server healthcheck through AspNetCore.HealthChecks.NpgSql 9.0.0. Without a direct Npgsql dependency, that package resolves Npgsql 8.0.3.

After the default Postgres image moved from postgres:17.6 to postgres:18.3, the Npgsql 8.0.3 healthcheck can time out even while the container is running and accepting connections. When postgres_check never becomes healthy, the Postgres ResourceReadyEvent is not published, so the AddDatabase(...) creation hook does not run and child database resources can remain missing/unhealthy.

Local repro evidence against postgres:18.3:

• direct Npgsql 8.0.3 connection timed out
• AspNetCore.HealthChecks.NpgSql 9.0.0 with transitive Npgsql 8.0.3 reported unhealthy
• direct Npgsql 9.0.5 / 10.0.1 connections succeeded
• AspNetCore.HealthChecks.NpgSql 9.0.0 with explicit newer Npgsql reported healthy

Testing

dotnet test --project tests/Aspire.Hosting.PostgreSQL.Tests/Aspire.Hosting.PostgreSQL.Tests.csproj -- --filter-method "*PostgresFunctionalTests.VerifyPostgresResource" --filter-method "*PostgresFunctionalTests.AddDatabaseCreatesDatabaseResiliently"

Passed: total 2, failed 0, succeeded 2

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a direct package reference to Npgsql in the Aspire.Hosting.PostgreSQL project, along with the corresponding centralized package version entry.

Changes:

• Added Npgsql 10.0.2 entry to Directory.Packages.props.
• Added a PackageReference to Npgsql in Aspire.Hosting.PostgreSQL.csproj.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Directory.Packages.props	Registers centrally-managed Npgsql version 10.0.2.
src/Aspire.Hosting.PostgreSQL/Aspire.Hosting.PostgreSQL.csproj	Adds direct Npgsql package dependency to the PostgreSQL hosting project.

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17558

Or

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