automate publishing docs with github actions

.github/workflows/post-integration.yaml

@@ -0,0 +1,27 @@
+name: Post-integration
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  deploy-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 📥 Checkout repository
+        uses: actions/checkout@v3
+
+      - name: 🧰 Setup nix
+        uses: cachix/install-nix-action@v22
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: 🔨 Build Docs
+        run: |
+          nix develop --show-trace --command bash -c "npm i && npm run docs"
+      
+      - name: 📘 Publish
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs