Add Hetzner Cloud server template example

[Excellencedev]

Description

This PR adds a template example for the Hetzner Cloud Sever.

This video shows the provisioning of multiple hetzner instances in coder with dynamic param enabled, running simultaneously and shown in the Hetzner console, checking labels on both the OS Filesystem and on the hetzner console and then shutting down through coder demonstrating clean up on hetzner and deleting workspaces without errors
DEMO VIDEO: https://drive.google.com/file/d/1JkhjszCRM9K27XDlMi_2nXtJosoflns_/view?usp=sharing

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Template Information

Path: registry/Excellencedev/templates/hetzner-linux

Testing & Validation

• Tests pass (bun test)
• Code formatted (bun fmt)
• Changes tested locally

Related Issues

/closes #209
/claim #209

[matifali]

Hi @Excellencedev, there is an existing PR #426 addressing the same issue. I will let @DevelopmentCats take a look at that first, and if that does not solve the issue, we can happily review your PR. Thank you.

[Copilot]

Pull request overview

This PR adds a new Hetzner Cloud server template to the Coder registry, enabling users to provision Linux-based workspaces on Hetzner Cloud infrastructure with configurable server types and locations.

Key changes:

• Terraform configuration for provisioning Hetzner Cloud servers with persistent volumes
• Dynamic server type selection based on location availability
• Cloud-init configuration for automated workspace setup

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
registry/Excellencedev/templates/hetzner-linux/main.tf	Core Terraform configuration defining server resources, volumes, and Coder integration
registry/Excellencedev/templates/hetzner-linux/cloud-config.yaml.tftpl	Cloud-init template for server initialization and Coder agent setup
registry/Excellencedev/templates/hetzner-linux/README.md	Documentation describing template usage and prerequisites
registry/Excellencedev/README.md	Author profile metadata for the registry
.icons/hetzner.svg	Hetzner logo SVG for template branding
.github/typos.toml	Added "hel" exception for Helsinki location code
registry/Excellencedev/templates/hetzner-linux/hetzner_server_types.json	Server type metadata and location availability mapping

[DevelopmentCats]

I will go ahead and take a look and test this today since the other PR has been stale for a bit.

[DevelopmentCats]

@Excellencedev Honestly everything works great here, but one thing you may want to add to the template readme, is a GFM Alert Warning about the workspace storage not being persistent when the workspace stops.