feat: Add a workflow to publish the crate through OIDC token exchange

.github/workflows/publish.yml

@@ -0,0 +1,38 @@
+name: Publish to crates.io
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish-crate:
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      contents: read
+      # Required for OIDC token exchange
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Crates.io authentication
+        uses: rust-lang/crates-io-auth-action@b7e9a28eded4986ec6b1fa40eeee8f8f165559ec # v1.0.3
+        id: auth
+
+      - name: Verify version matches tag
+        run: |
+          CARGO_VERSION=$(grep -m1 '^version' Cargo.toml | sed 's/.*"\(.*\)".*/\1/')
+          TAG_VERSION="${GITHUB_REF_NAME#v}"
+          echo "Cargo.toml version: $CARGO_VERSION"
+          echo "Git tag version: $TAG_VERSION"
+          if [ "$CARGO_VERSION" != "$TAG_VERSION" ]; then
+            echo "Error: Cargo.toml version ($CARGO_VERSION) does not match tag ($TAG_VERSION)"
+            exit 1
+          fi
+
+      - name: Publish to crates.io
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}