add workflow

.github/workflows/hack.yml

@@ -0,0 +1,31 @@
+name: Hack
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  hack:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo
+            target
+          key: ${{ matrix.os }}-hack
+
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install dependencies
+        run: cargo install cargo-hack --locked
+      - name: Deny
+        run: cargo deny check