ci: add docs build

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

.github/workflows/docs.yml

@@ -0,0 +1,40 @@
+name: Docs
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v3
+      - uses: actions/checkout@v3
+      - name: Build docs
+        run: cargo doc --no-deps
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: target/doc
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v3