Enhance Makefile to tag Docker images as latest in addition to timestamp tags

[Copilot]

This PR enhances the build and build_code targets in the Makefile to automatically tag the resulting Docker images as latest in addition to their existing timestamp-based tags.

Changes Made

For the build target:

• After building gds:YYYY-MM-DD_ARCH, now also tags the image as gds:latest

For the build_code target:

• After building gds_code:YYYY-MM-DD_ARCH, now also tags the image as gds_code:latest

Implementation Details

• Uses chained commands with && to ensure latest tagging only occurs after successful builds
• Maintains all existing functionality and behavior
• No changes to Makefile structure or other targets
• Minimal footprint: only 4 lines added, 2 lines modified

Example Usage

After running make build, you'll now have both:

gds:2025-08-04_amd64    # Timestamp-based tag (existing behavior)
gds:latest              # Latest tag (new)

After running make build_code, you'll now have both:

gds_code:2025-08-04_amd64    # Timestamp-based tag (existing behavior)  
gds_code:latest              # Latest tag (new)

This makes it easier to reference the most recent builds without needing to know the specific timestamp, while preserving the existing timestamp-based versioning for reproducibility.

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