add release job to CI (#493)

Author: davidhewitt

.github/workflows/release.yml

@@ -0,0 +1,21 @@
+name: Release Rust Crate
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    environment: release
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Publish to crates.io
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}