ci: Set up crates.io trusted publishing (#46)

Author: kylebarron

.github/workflows/rust-release.yml

@@ -0,0 +1,20 @@
+name: Publish to crates.io
+on:
+  push:
+    # Triggers when pushing tags starting with 'v'
+    tags: ["v*"]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: rust-release
+    permissions:
+      # Required for OIDC token exchange
+      id-token: write
+    steps:
+      - uses: actions/checkout@v5
+      - uses: rust-lang/crates-io-auth-action@v1
+        id: auth
+      - run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}