ci: add cargo audit job

.gitlab-ci.yml

@@ -127,6 +127,13 @@ docs-jsonrpc:
   tags:
     - shell
 
+cargo-audit:
+  stage:                           misc
+  script:
+    - scripts/gitlab/audit.sh
+  tags:
+    - rust-stable
+
 test-android:
   stage:                           misc
   image:                           parity/rust-android:gitlab-ci

scripts/gitlab/audit.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e # fail on any error
+set -u # treat unset variables as error
+
+rustup default stable
+
+git submodule update --init --recursive
+
+rustup show
+cargo install cargo-audit
+cargo audit