Tests - Build Windows IIS images - use docker build kit

[Kielek]

Why

from test-build-windows-container-tests (windows-2022, windows-only, windows-2022)

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.�[0m
               Install the buildx component to build images with BuildKit:�[0m
               https://docs.docker.com/go/buildx/�[0m

What

Tests - Build Windows IIS images - use docker build kit

Tests

CI

Checklist

• [ ] CHANGELOG.md is updated.
• [ ] Documentation is updated.
• [ ] New features are covered by tests.

[Kielek]

@nrcventura, unfortunately, I do not have good news. We should stay with deprecated version, as modern one is still in experimental stage.

I have checked, if you see any better options, please let me know. Otherwise we can close:

BuildKit and Windows Containers Investigation

Problem Summary

The CI build for Windows container tests (test-build-windows-container-tests) was failing with Docker-related errors on Windows Server 2022/2025 runners.

Root Cause

BuildKit does not properly support Windows containers. While BuildKit has experimental Windows support since v0.13, it requires complex manual setup and is not production-ready.

Attempts Made

Attempt 1: Enable BuildKit

• Action: Set DOCKER_BUILDKIT=1 environment variable
• Result: ❌ Failed
• Error: ERROR: BuildKit is enabled but the buildx component is missing or broken

Attempt 2: Install buildx via docker/setup-buildx-action

• Action: Added docker/setup-buildx-action@v3 step to CI workflow
• Result: ❌ Failed
• Error: no matching manifest for windows(10.0.20348)/amd64 in the manifest list entries
• Reason: The action tried to pull a Linux-based buildkit container which doesn't work on Windows

Attempt 3: Use buildx with docker driver

• Action: Added driver: docker to buildx setup
• Result: ❌ Failed
• Error: buildkit executor not implemented for windows
• Reason: BuildKit's executor simply doesn't support Windows containers, even with the native docker driver

References

• BuildKit Windows documentation: https://docs.docker.com/build/buildkit/#buildkit-on-windows
• BuildKit Windows issues: https://github.com/moby/buildkit/issues?q=is%3Aissue+state%3Aopen+label%3Aarea%2Fwindows-wcow
• BuildKit Windows support tracking: Unable to use Buildkit with Windows containers moby/buildkit#616