Test trusted publishing workflow

The maintainer is responsible for tagging and cutting a release that's
passed other CI checks. To publish the package, create a release on a
'v*' tag.

Intentionally including --dry-run while I test things out.

Author: mciantyre

.github/workflows/release.yml

@@ -0,0 +1,19 @@
+name: Publish release to crates.io
+on:
+  release:
+    types: [ published ]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      id-token: write
+    steps:
+    - uses: actions/checkout@v6
+    - uses: rust-lang/crates-io-auth-action@v1
+      id: auth
+    - run: rustup toolchain install stable --no-self-update --profile minimal
+    - run: cargo package --package=imxrt-dma
+    - run: cargo publish --package=imxrt-dma --dry-run
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}