feat(docker): add Dockerfile.local for local development and fix migrations

[fabioluciano]

Summary

This PR introduces local development improvements and migration fixes:

Docker Changes:

• Add Dockerfile.local for faster local development (single-platform build, no multi-arch cross-compilation)
• Update docker-compose-dev.yml to use local Dockerfile with development-friendly environment variables
• Fix libgit2 version from 1.3.2 → 1.3.0 in production Dockerfile for consistency

Migration Improvements:

• Add missing index to tool_github_jobs table
• Improve error handling and transaction management in multiple migration scripts
• Add scope_config_id fields to S3 and project tables
• Refactor character set and commit character type migrations for better reliability

Does this close any open issues?

No related issues.

Screenshots

N/A - Backend changes only.

Other Information

The new Dockerfile.local significantly speeds up local builds by:

• Building for native platform only (no cross-compilation)
• Simplifying libgit2 installation
• Including FORCE_MIGRATION=true for easier local testing