fix: add --load to buildx to ensure images are available locally

[AaronFeledy]

Summary

• Adds --load flag to buildx command to load built images into the local Docker daemon

Problem

When building v4 services with buildx, the resulting image was sometimes not found:

(HTTP code 404) no such image - No such image: lando/<image>:latest

By default, docker buildx build only stores images in the buildx cache—not the local Docker daemon's image store. When Docker Compose later tries to start containers, it can't find the image.

Solution

Add --load (--output=type=docker) to export the build result into the local Docker daemon, making images immediately available for use.

---

Note

Ensures images built with Buildx are available to the local Docker daemon.

• Adds --load to buildx build in components/docker-engine.js so --tagged images are loaded locally
• Updates CHANGELOG.md under UNRELEASED to document the fix

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