Set up Nonguix channel early

.github/workflows/build.yaml

@@ -21,13 +21,24 @@ jobs:
 
       - name: Install Guix
         uses: PromyLOPh/guix-install-action@v1.5
+        with:
+          channels: |
+            (cons* (channel
+                     (name 'nonguix)
+                     (url "https://gitlab.com/nonguix/nonguix")
+                     (introduction
+                       (make-channel-introduction
+                         "897c1a470da759236cc11798f4e0a5f7d4d59fbc"
+                         (openpgp-fingerprint
+                           "2A39 3FFF 68F4 EF7A 3D29  12AF 6F51 20A0 22FB B2D5"))))
+                    %default-channels)
 
       - name: Set up Nonguix Substitutes
         run: |
           # This is necessary to authorize the substitute server
           wget https://substitutes.nonguix.org/signing-key.pub
           mv signing-key.pub nonguix-signing-key.pub
-          sudo guix archive --authorize < nonguix-signing-key.pub
+          guix archive --authorize < nonguix-signing-key.pub
 
       - name: Build ISO
         run: |