manual: Add tutorial on how to use nixos-install with Colmena

manual/src/SUMMARY.md

@@ -4,6 +4,7 @@
 - [Tutorial](./tutorial/index.md)
     - [Usage with Flakes](./tutorial/flakes.md)
     - [Migrating from NixOps/morph](./tutorial/migration.md)
+    - [Bootstrapping a new install](./tutorial/bootstrapping-a-new-system.md)
 - [Features](./features/index.md)
     - [Node Tagging](./features/tags.md)
     - [Local Deployment](./features/apply-local.md)

manual/src/tutorial/bootstrapping-a-new-system.md

@@ -0,0 +1,44 @@
+# Bootstrapping a new install
+
+Colmena doesn't support a `nixos-install` like interface out-of-the-box, but you can easily pass the closure that
+Colmena builds to `nixos-install` directly!
+
+This tutorial assumes you have SSH access to your live ISO
+
+First, create your partitions and make your filesystems as you normally would, then mount them and run
+
+```sh
+nixos-generate-config --root /mnt # replace /mnt to wherever your root filesystem is mounted at
+```
+
+Or if you already have a configuration ready, simply output your hardware configuration to the console.
+```
+nixos-generate-config --root /mnt --show-hardware-config
+```
+
+For those using third-party secret management tools like `agenix`, it is necessary to generate your host
+keys and make your configuration aware of it before copying the closure to the ISO
+
+```sh
+$ mkdir -p /mnt/etc/ssh
+$ ssh-keygen -A -f /mnt # replace /mnt with your root filesystem mount
+```
+
+After you've adjusted your configuration to fit the needs of the new node, you can go ahead
+and build the closure for the new system!
+
+```sh
+colmena build --on node --no-build-on-target
+```
+
+Copy the closure over to the running live NixOS ISO!
+```sh
+nix copy /nix/store/myclosure --to ssh://live@iso
+```
+
+Finally, you can pass the closure to `nixos-install` to be installed on your new node!
+```sh
+nixos-install --system /nix/store/myclosure
+````
+
+You can proceed with installation as you would normally without using Colmena!