Add GH Actions workflow to publish docs to GH Pages

.github/workflows/publish-docs.yml

@@ -0,0 +1,46 @@
+name: Publish documentation
+
+on:
+  workflow_call:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  build_docs:
+    name: Build documentation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      - name: Set up Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+
+      - name: Build documentation
+        run: cargo doc --workspace --release
+
+      - name: Create index.html file
+        run: echo '<meta http-equiv="refresh" content="0;url=numbrs/index.html">' > ./target/doc/index.html
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./target/doc
+
+  deploy_docs:
+    name: Deploy documentation site
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build_docs
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/release.yml

@@ -10,6 +10,10 @@ jobs:
     name: Build
     uses: ./.github/workflows/build.yml
 
+  publish_docs:
+    name: Publish documentation
+    uses: ./.github/workflows/publish-docs.yml
+
   publish-binaries:
     name: Upload Numbrs binaries to GitHub release
     if: ${{ github.event_name == 'release' }}