refactor: one dockerfile to rule them all

[sfroment]

Why is this change necessary?

It will be way easier to handle and also it will give us shared caching and just good things overall

Description

Remove previous docker and use 1 dockerfile with better caching

Closes #issue_number

Type of change

• Other (please describe): Refactor Docker setup

Checklist

• I have tested my changes
• I have updated documentation if needed
• I have reviewed my code for best practices

[Copilot]

Pull request overview

This PR consolidates three separate Dockerfiles (node, sequencer, and prover) into a single unified Dockerfile.target that uses cargo-chef for improved dependency caching and build efficiency. The changes also update the justfile to use a GitHub Container Registry path and reference the new unified Dockerfile.

Key Changes:

• Unified Docker build strategy using multi-stage builds with cargo-chef for better caching
• Rust version upgraded from 1.88 to 1.90
• Registry path changed from "1sixtech" to "ghcr.io/1sixtech"

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docker/Dockerfile.target	New unified Dockerfile supporting all three binaries (node, sequencer, prover) with cargo-chef for dependency caching
justfile	Updated docker-build and docker-run commands to use new registry path and unified Dockerfile
docker/Dockerfile.node	Removed - replaced by unified Dockerfile.target
docker/Dockerfile.sequencer	Removed - replaced by unified Dockerfile.target
docker/Dockerfile.prover	Removed - replaced by unified Dockerfile.target

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.