ci: enable crates.io trusted publishing

Author: ibruno

.github/workflows/release-plz.yml

@@ -21,6 +21,10 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Authenticate with crates.io
+        uses: rust-lang/crates-io-auth-action@v1
+        id: auth
+
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561
         with:
@@ -30,3 +34,4 @@ jobs:
         uses: MarcoIeni/release-plz-action@e592230ad39e3ec735402572601fc621aa24355c # v0.5.124
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}