Document Hetzner installation (#11)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

Author: kvaps

content/en/docs/how-tos/_index.md

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+---
+title: "How Tos"
+linkTitle: "How Tos"
+description: "Cozystack how tos."
+weight: 45
+---

content/en/docs/how-tos/hetzner.md

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+---
+title: How to install Cozystack in Hetnzer
+linkTitle: Hetzner
+description: "How to install Cozystack in Hetzner"
+weight: 10
+---
+
+{{% alert color="warning" %}}
+:warning: Secure Boot is currently not supported.
+
+If your server configured to use Secure Boot, you need to disable this feature in your BIOS. Otherwise, it will block the server from booting after Talos Linux installation.
+{{% /alert %}}
+
+Switch your server into rescue mode
+
+Login to the server using SSH
+
+Check Disks:
+
+```console
+# lsblk
+NAME        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
+nvme0n1     259:4    0 476.9G  0 disk
+nvme1n1     259:0    0 476.9G  0 disk
+```
+
+Download Talos Linux asset from the Cozystack's [releases page](https://github.com/aenix-io/cozystack/releases), and write it into disk:
+
+```bash
+cd /tmp
+wget https://github.com/aenix-io/cozystack/releases/download/v0.2.0/metal-amd64.raw.xz
+xz -d -c /tmp/metal-amd64.raw.xz | dd of=/dev/nvme0n1 bs=4M oflag=sync
+```
+
+Resize the partition table and prepare additional partition for the cloud-init data:
+
+```bash
+# resize gpt partition
+sgdisk -e /dev/nvme0n1
+
+# Create 20MB partition in the end of disk
+end=$(sgdisk -E /dev/nvme0n1)
+sgdisk -n7:$(( $end - 40960 )):$end -t7:ef00 /dev/nvme0n1
+
+# Create fat partion for cloud-init
+mkfs.vfat -n CIDATA /dev/nvme0n1p7
+
+# Mount cloud-init partition
+mount  /dev/nvme0n1p7 /mnt
+```
+
+Write cloud-init configuration
+
+```bash
+echo 'local-hostname: us-talos-1' > /mnt/meta-data
+echo '#cloud-config' > /mnt/user-data
+echo 'version: 2' > /mnt/network-config
+```
+
+Edit network-config and specify your network settings using [network-config-format-v2](https://cloudinit.readthedocs.io/en/latest/reference/network-config-format-v2.html).
+
+```yaml
+version: 2
+ethernets:
+  eth0:
+    match:
+      macaddress: 'a6:34:9e:c0:25:6b'
+    dhcp4: false
+    addresses:
+      - "1.2.3.4/26"
+      - "2a01:4f3:341:524::2/64"
+    gateway4: "1.2.3.1"
+    gateway6: "fe80::1"
+    nameservers:
+      search: [cluster.local]
+      addresses: [8.8.8.8]
+```
+
+You can find more comprehensive example under the [link](https://github.com/siderolabs/talos/blob/10f958cf41ec072209f8cb8724e6f89db24ca1b6/internal/app/machined/pkg/runtime/v1alpha1/platform/nocloud/testdata/metadata-v2.yaml)
+
+Umount cloud-init partition, sync changes, and reboot the server
+
+```bash
+umount /mnt
+sync
+reboot
+```
+
+Now, when it is booted to Talos Linux maintenance mode, you can use [talos-bootstrap](https://github.com/aenix-io/talos-bootstrap) to bootstrap the cluster:
+
+```
+talos-bootstrap install -n 1.2.3.4
+```
+
+Where `1.2.3.4` is the IP-address of your remote node.
+
+
+Now follow **Get Started** guide starting from the [**Bootstrap cluster**](/docs/get-started/#bootstrap-cluster) section, to continue the installation.