update ci workflow

.forgejo/workflows/deploy.yaml

@@ -2,20 +2,17 @@ on:
   push:
     branches:
       - main
-
 jobs:
   build:
-    runs-on: default
+    runs-on: docker
     steps:
       - name: Checkout Repo
         uses: https://code.forgejo.org/actions/checkout@v4
 
-      - name: Install Go
-        uses: https://code.forgejo.org/actions/setup-go@v4
-        with:
-          go-version: "1.21.6"
+      - name: Setup Nix
+        uses: https://github.com/cachix/install-nix-action@v27
 
-      - name: Run Hugo
+      - name: Build Docs
         run: |
           nix develop
           nix build .#md-manual --out-link docs