build(docker): default DOCKER_IMAGE to ghcr.io/informedica/genpres

[7sharp9]

DockerBuild/DockerRun still defaulted to halcwb/genpres, left over from before #459/#482 wired up GHCR publishing on release. Align the local default with what tag-release.yml publishes so a plain dotnet run DockerBuild produces the same image name as CI. Update the DEVELOPMENT.md references to match.

[greptile-apps]

Greptile Summary

This PR changes the local Docker image default from halcwb/genpres to the GHCR repository used by release publishing and updates the main development documentation references.

• Uses ghcr.io/informedica/genpres for DockerBuild and DockerRun when DOCKER_IMAGE is unset.
• Updates Docker build and release documentation to describe the GHCR default.
• Leaves one later runtime example referring to the obsolete image.

Confidence Score: 4/5

The PR appears safe to merge, with one non-blocking stale Docker command in the development documentation.

The build behavior consistently uses the new GHCR image name; only a later documentation example remains inconsistent and may direct developers to the obsolete image.

Files Needing Attention: DEVELOPMENT.md

Important Files Changed

Filename	Overview
Build.fs	Changes the shared Docker image default to the same GHCR repository used by the release workflow; build, inspect, and run continue to use the value consistently.
DEVELOPMENT.md	Updates the principal Docker image references, but one environment-configuration example still uses halcwb/genpres.

Comments Outside Diff (1)

1. DEVELOPMENT.md, line 330 (link)

   Stale Docker image example

   The updated documentation establishes ghcr.io/informedica/genpres as the default, but the later runtime example still invokes halcwb/genpres, directing developers to the obsolete image repository.

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