ci: switch crates.io publishing to Trusted Publishing (OIDC)

Replaces token-based publish-crate.yml with OIDC release.yml (env release).

Author: ajsb85

.github/workflows/publish-crate.yml

@@ -0,0 +1,38 @@
+name: Publish to crates.io
+
+# Publishes via crates.io Trusted Publishing (OIDC) — no API token secret.
+# Configure the matching publisher at:
+#   crates.io > cobs_codec_rs > Settings > Trusted Publishing
+#   owner=firechip  repo=cobs_codec_rs  workflow=release.yml  environment=release
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    name: Publish to crates.io (Trusted Publishing)
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      id-token: write # required for the OIDC token exchange
+      contents: read
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Verify before publishing
+        run: |
+          cargo fmt --check
+          cargo clippy --all-targets --all-features -- -D warnings
+          cargo test --all-features
+      - name: Authenticate to crates.io (OIDC)
+        uses: rust-lang/crates-io-auth-action@v1
+        id: auth
+      - name: Publish
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}