docs: configure gh-pages deployment

.github/workflows/docs.yml

@@ -0,0 +1,46 @@
+name: docs
+
+on:
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Show env
+      run: |
+        uname -a
+        ldd --version
+    - name: Install
+      run: |
+        curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain nightly
+        rustup toolchain install nightly --allow-downgrade -c rustfmt
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+    - name: Build
+      run: |
+        cd jay-config
+        cargo doc
+    - name: Setup Pages
+      uses: actions/configure-pages@v2
+    - name: Upload artifact
+      uses: actions/upload-pages-artifact@v1
+      with:
+        path: './target/doc'
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v1