Replace audit check on PR push with periodical job

.github/workflows/audit.yml

@@ -0,0 +1,12 @@
+name: Security audit
+on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -38,25 +38,13 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
-  audit:
+  security_audit:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          default: true
-      - name: Install cargo-audit
-        uses: actions-rs/[email protected]
+      - uses: actions-rs/audit-check@v1
         with:
-          crate: cargo-audit
-          version: latest
-          use-tool-cache: true
-      - name: Audit
-        run: cargo audit --deny warnings
-
+          token: ${{ secrets.GITHUB_TOKEN }}
 
   build-and-test:
     strategy: