ci: set up crates.io trusted publishing

Author: MingweiSamuel

.github/workflows/publish.yml

@@ -0,0 +1,17 @@
+name: Publish to crates.io
+on:
+  push:
+    tags: ['v*']  # Triggers when pushing tags starting with 'v'
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: publish  # For enhanced security
+    permissions:
+      id-token: write # Required for OIDC token exchange
+    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 }}