Add Alpine and systemd cloud-init templates

cloud-init/user-data-alpine.yml.tftpl

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+#cloud-config
+
+# 1. Hostname configuration
+hostname: ${hostname}
+fqdn: ${hostname}
+preserve_hostname: false
+
+# 2. User creation
+# On Alpine, the privilege escalation group is "wheel" (not "sudo").
+# Keep the default shell (ash/busybox) to stay lightweight.
+users:
+  - name: ${username}
+    sudo: ALL=(ALL) NOPASSWD:ALL
+    groups: wheel
+    ssh_authorized_keys:
+      - ${ssh_key}
+
+# 3. apk repositories configuration
+# Pin the two repositories used on this homelab: edge/main + edge/community.
+# Written BEFORE package_update/package_upgrade so apk uses this config immediately.
+write_files:
+  - path: /etc/apk/repositories
+    owner: root:root
+    permissions: '0644'
+    content: |
+      http://dl-cdn.alpinelinux.org/alpine/edge/main
+      http://dl-cdn.alpinelinux.org/alpine/edge/community
+
+# 4. System update (apk)
+package_update: true
+package_upgrade: true
+
+# 5. Package installation
+# - qemu-guest-agent: main repo (required so Proxmox/Terraform can read the VM IP)
+# - tailscale: community repo
+packages:
+  - qemu-guest-agent
+  - curl
+  - sudo
+  - tailscale
+
+# 6. Services & configuration (OpenRC, not systemd)
+# Intentional order: qemu-guest-agent first to unblock Terraform as soon as possible.
+runcmd:
+  # Enable and start qemu-guest-agent via OpenRC
+  - [ rc-update, add, qemu-guest-agent, default ]
+  - [ rc-service, qemu-guest-agent, start ]
+  # Enable and start Tailscale via OpenRC
+  - [ rc-update, add, tailscale, default ]
+  - [ rc-service, tailscale, start ]
+  # Register the node with the tailnet
+  - [ tailscale, up, --authkey=${tailscale_auth_key}, --hostname=${vm_name} ]

cloud-init/user-data-systemd.yml.tftpl

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+#cloud-config
+
+# 1. Hostname configuration
+hostname: ${hostname}
+fqdn: ${hostname}
+preserve_hostname: false
+
+# 2. User creation
+users:
+  - name: ${username}
+    sudo: ALL=(ALL) NOPASSWD:ALL
+    groups: sudo, admin
+    shell: /bin/bash
+    ssh_authorized_keys:
+      - ${ssh_key}
+
+# 3. System update
+package_update: true
+package_upgrade: true
+
+# 4. Package installation
+packages:
+  - qemu-guest-agent
+  - curl
+
+# 5. Tailscale installation and configuration
+runcmd:
+  # Enable and start qemu-guest-agent (systemd)
+  - [ systemctl, enable, qemu-guest-agent, --now ]
+  # Install and configure Tailscale
+  - [ sh, -c, "curl -fsSL https://tailscale.com/install.sh | sh" ]
+  - [ tailscale, up, --authkey=${tailscale_auth_key}, --hostname=${vm_name} ]