feat(ci): adds cargo audit workflow (#1318)

* feat(ci): adds cargo audit workflow

* feat(audit): ignore serde_cbor dev-dependency

.cargo/audit.toml

@@ -0,0 +1,4 @@
+[advisories]
+ignore = [
+    "RUSTSEC-2021-0127", # serde_cbor dependency through the criterion dev-dependency
+]

.github/workflows/audit-on-push.yml

@@ -0,0 +1,14 @@
+name: Security audit
+on:
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+jobs:
+  security_audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}