ci: add build site job

.github/workflows/site.yml

@@ -0,0 +1,32 @@
+name: Deploy documentation site
+on:
+  push:
+    branches: [master]
+
+jobs:
+  build-site:
+    name: Build website
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@v15
+      - run: make build
+      - name: Upload artifact
+        id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: result/
+  deploy-site:
+    name: Deploy website
+    needs: build-site
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

Makefile

@@ -6,6 +6,10 @@ docs-serve:
 docs-build:
 	hugo -s docs/website
 
+.PHONY: build
+build:
+	{ command -v nix >/dev/null && nix build -f docs/ website; } || { nix-build docs/ -A website; }
+
 .PHONY: check
 check:
 	{ command -v nix > /dev/null && nix flake check; } || { nix-build tests -A configs -A lib; }