ci: add cargo-nono step

Author: daviddrysdale

.github/workflows/ci.yml

@@ -113,6 +113,25 @@ jobs:
       - run: rustc --version
       - run: cargo doc --no-deps --document-private-items
 
+  nono:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-01
+          override: true
+          components: rustfmt
+      - run: cargo install --git https://github.com/daviddrysdale/cargo-nono --branch allowlist cargo-nono
+      - run: cargo nono check --package tink-proto --allow spin
+      - run: cargo nono check --package tink-core --allow spin
+      - run: cargo nono check --package tink-prf --allow spin
+      - run: cargo nono check --package tink-mac --allow spin
+      - run: cargo nono check --package tink-aead --allow spin
+      - run: cargo nono check --package tink-daead --allow spin
+      - run: cargo nono check --package tink-signature --allow spin --allow signature --allow ed25519-dalek
+
   udeps:
     runs-on: ubuntu-latest
     steps: