feat: added hetzner cloud terraform configuration

infra/hetzner/README.md

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+# Hetzner Cloud Terraform Setup
+
+This directory manages Hetzner Cloud resources using Terraform.
+
+## Prerequisites
+- Create a Hetzner Cloud API token: https://console.hetzner.cloud/projects
+- (Optional) Register your SSH key in Hetzner Cloud for secure access.
+
+## Usage
+1. Set your API token as an environment variable:
+   ```bash
+   export TF_VAR_hcloud_token="<your-token>"
+   ```
+2. (Optional) Set SSH key names, image, and location:
+   ```bash
+   export TF_VAR_hcloud_ssh_keys='["your-key-name"]'
+   ```
+3. Run Terraform:
+   ```bash
+   terraform init
+   terraform plan
+   terraform apply
+   ```
+
+## Outputs
+- The server's public IPv4 address and ID will be shown after apply.
+
+## Destroying the Server
+```bash
+terraform destroy
+```

infra/hetzner/main.tf

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+terraform {
+  backend "pg" {
+    schema_name = "yumeami_hetzner"
+    conn_str    = "postgres://shiori:5600/terraform?sslmode=disable"
+  }
+
+  required_providers {
+    hcloud = {
+      source  = "hetznercloud/hcloud"
+      version = "~> 1.42.0"
+    }
+  }
+}
+
+provider "hcloud" {
+  token = var.hcloud_token
+}
+
+resource "hcloud_server" "tobira" {
+  name = "tobira"
+
+  server_type = "cx22"
+  image       = "ubuntu-24.04"
+  location    = "ash"
+  public_net {
+    ipv4_enabled = true
+    ipv6_enabled = true
+  }
+
+  firewall_ids = [hcloud_firewall.primary.id]
+  ssh_keys     = var.hcloud_ssh_keys
+}
+
+resource "hcloud_firewall" "primary" {
+  name = "primary"
+
+  rule {
+    destination_ips = [
+      "0.0.0.0/0",
+      "::/0",
+    ]
+    direction  = "out"
+    port       = "any"
+    protocol   = "tcp"
+    source_ips = []
+  }
+  rule {
+    destination_ips = []
+    direction       = "in"
+    port            = "any"
+    protocol        = "tcp"
+    source_ips = [
+      "0.0.0.0/0",
+      "::/0",
+    ]
+  }
+}
+

infra/hetzner/outputs.tf

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+output "server_id" {
+  description = "ID of the Hetzner server."
+  value       = hcloud_server.tobira.id
+}
+
+output "server_ipv4" {
+  description = "Public IPv4 address of the server."
+  value       = hcloud_server.tobira.ipv4_address
+}

infra/hetzner/variables.tf

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+variable "hcloud_token" {
+  description = "Hetzner Cloud API token."
+  type        = string
+  sensitive   = true
+}
+
+variable "hcloud_ssh_keys" {
+  description = "List of SSH key names registered in Hetzner Cloud."
+  type        = list(string)
+  default     = []
+}