feat(4): Replace workflow with three

.forgejo/workflows/cd.yml

@@ -0,0 +1,25 @@
+name: CD
+
+on:
+  workflow_dispatch:
+    inputs:
+      target:
+        description: "Deployment target"
+        required: true
+        type: choice
+        options:
+          - local
+          - staging
+          - prod
+
+jobs:
+  deploy:
+    runs-on: self-hosted
+    steps:
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: site-${{ github.sha }}
+          path: blog/
+      - name: Deploy
+        run: nix shell nixpkgs#rsync --command ./deploy.sh ${{ inputs.target }}