Add Trusted Publishing Config (#665)

Based off the one from `crypto-bigint`

Author: tarcieri

.github/workflows/publish.yml

@@ -0,0 +1,26 @@
+name: Publish to crates.io
+on:
+  push:
+    tags: [ 'v*' ]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: publish
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v6
+      - uses: rust-lang/crates-io-auth-action@v1
+        id: auth
+
+      - name: Check crate version
+        run: |
+          CRATE_VERSION=v$(grep -m 1 "^version =" Cargo.toml | cut -d'"' -f2)
+          echo $CRATE_VERSION ${{ github.ref_name }}
+          [[ $CRATE_VERSION == ${{ github.ref_name }} ]]
+
+      - name: Publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}
+        run: cargo publish