Does it build?

.github/workflows/build.yaml

@@ -0,0 +1,26 @@
+name: Build Guix Installer
+
+on:
+  push: main
+
+  # schedule:
+  #   # build every 2 weeks
+  #   - cron: "0 0 */14 * *"
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v2
+
+      - name: Install Guix
+        uses: PromyLOPh/guix-install-action@v1
+
+      - name: Build ISO
+        run: |
+          #$image=$(guix system image installer.scm)
+          guix system image installer.scm

installer.scm

@@ -0,0 +1,50 @@
+;;; Copyright © 2019 Alex Griffin <a@ajgrf.com>
+;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
+;;; Copyright © 2019 David Wilson <david@daviwil.com>
+;;;
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;; Generate a bootable image (e.g. for USB sticks, etc.) with:
+;; $ guix system disk-image nongnu/system/install.scm
+
+(define-module (nongnu system install)
+  #:use-module (gnu system)
+  #:use-module (gnu system install)
+  #:use-module (gnu packages version-control)
+  #:use-module (gnu packages vim)
+  #:use-module (gnu packages curl)
+  #:use-module (gnu packages emacs)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages mtools)
+  #:use-module (gnu packages package-management)
+  #:use-module (nongnu packages linux)
+  #:export (installation-os-nonfree))
+
+(define installation-os-nonfree
+  (operating-system
+    (inherit installation-os)
+    (kernel linux)
+    (firmware (list linux-firmware))
+
+    ;; Add the 'net.ifnames' argument to prevent network interfaces
+    ;; from having really long names.  This can cause an issue with
+    ;; wpa_supplicant when you try to connect to a wifi network.
+    (kernel-arguments '("quiet" "modprobe.blacklist=radeon" "net.ifnames=0"))
+
+    ;; Add some extra packages useful for the installation process
+    (packages
+     (append (list git curl stow vim emacs-no-x-toolkit)
+             (operating-system-packages installation-os)))))
+
+installation-os-nonfree