ci: add workflow to publish to crates.io (#1169)

Thanks!

.github/workflows/cd.yml

@@ -0,0 +1,16 @@
+name: Continuous Deployment
+on:
+  push:
+    tags:
+      - "v*.*.*"
+jobs:
+  publish-crates-io:
+    name: Publish on crates.io
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v5
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Publish
+        run: cargo publish --token ${{ secrets.CARGO_TOKEN }}