Attempt to fix permissions issue

Author: ewpratten

.github/workflows/audit.yml

@@ -1,9 +1,20 @@
 name: Security audit
+
 on:
   push:
     paths: 
       - '**/Cargo.toml'
       - '**/Cargo.lock'
+      - '.github/workflows/audit.yml'
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  issues: write
+  checks: write
+  pull-requests: read
+  contents: read
+
 jobs:
   security_audit:
     runs-on: ubuntu-latest