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pipeline: add testing improvements for branch-based workflows

Implement dual improvements to enable efficient testing of pipeline changes
without polluting master branch:

1. Add --force flag to create-host script
   - Skip hostname/IP uniqueness validation
   - Overwrite existing host configurations
   - Update entries in flake.nix and terraform/vms.tf (no duplicates)
   - Useful for iterating on configurations during testing

2. Add branch support to bootstrap mechanism
   - Bootstrap service reads NIXOS_FLAKE_BRANCH environment variable
   - Defaults to master if not set
   - Uses branch in git URL via ?ref= parameter
   - Service loads environment from /etc/environment

3. Add cloud-init disk support for branch configuration
   - VMs can specify flake_branch field in terraform/vms.tf
   - Automatically generates cloud-init snippet setting NIXOS_FLAKE_BRANCH
   - Uploads snippet to Proxmox via SSH
   - Production VMs omit flake_branch and use master

4. Update documentation
   - Document --force flag usage in create-host README
   - Add branch testing examples in terraform README
   - Update TODO.md with testing workflow
   - Add .generated/ to gitignore

Testing workflow: Create feature branch, set flake_branch in VM definition,
deploy with terraform, iterate with --force flag, clean up before merging.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-01 16:34:28 +01:00