Add workflow for building all relevant configs

.forgejo/workflows/build_nixos_configs.yml

@@ -0,0 +1,19 @@
+name: Buill NixOS Configurations
+on: [push]
+
+jobs:
+  Explore-Forgejo-Actions:
+    runs-on: nix-builder
+    strategy:
+      matrix:
+        system:
+          - "carbon"
+          - "git"
+          - "gospel"
+          - "node"
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - run: |
+          echo 'Building configuration for ${{ matrix.system }}'
+          nix build .#nixosConfigurations.${{ matrix.system }}.config.system.build.toplevel

.forgejo/workflows/demo.yaml

@@ -1,20 +0,0 @@
-name: Forgejo Actions Demo
-run-name: ${{ forgejo.actor }} is testing out Forgejo Actions 🚀
-on: [push]
-
-jobs:
-  Explore-Forgejo-Actions:
-    runs-on: nix-builder
-    steps:
-      - run: echo "🎉 The job was automatically triggered by a ${{ forgejo.event_name }} event."
-      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Forgejo!"
-      - run: echo "🔎 The name of your branch is ${{ forgejo.ref }} and your repository is ${{ forgejo.repository }}."
-      - name: Check out repository code
-        uses: actions/checkout@v4
-      - run: echo "💡 The ${{ forgejo.repository }} repository has been cloned to the runner."
-      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
-      - name: List files in the repository
-        run: |
-          ls ${{ forgejo.workspace }}
-      - run: nix build .#nixosConfigurations.gospel.config.system.build.toplevel
-      - run: echo "🍏 This job's status is ${{ job.status }}."