Add CI workflows for docs publishing

Author: lvignoli

.github/workflows/docs.yml

@@ -0,0 +1,29 @@
+name: docs
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  upload-artifacts:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: mlugg/setup-zig@v2
+      - run: zig build docs
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: zig-out/docs/
+
+  deploy-pages:
+    needs: upload-artifacts
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4