ci: add cargo audit workflow

Signed-off-by: Pau Capdevila <pau@githedgehog.com>

Author: pau-hedgehog

.github/workflows/cargo-audit.yaml

@@ -0,0 +1,22 @@
+name: Cargo Audit
+
+on:
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+  pull_request:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
+      - name: Run cargo audit
+        run: cargo audit