Add docsga

.github/workflows/docs.yaml

@@ -0,0 +1,57 @@
+name: Docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Build
+
+    permissions:
+      contents: read
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          extra-conf: |
+            extra-experimental-features = nix-command flakes
+
+      - name: Set up cache
+        uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Build docs
+        run: nix -L build github:${{ github.repository }}/${{ github.sha }}#docs
+
+      - name: Prepare docs for upload
+        run: cp -r --dereference --no-preserve=mode,ownership result/ public/
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: public/
+
+  deploy:
+    name: Deploy
+
+    needs: build
+
+    permissions:
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Deploy docs to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4