chore: Add audit workflow

.gitea/workflows/audit.yaml

@@ -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@v4
+      - uses: rustsec/audit-check@v2.0.0
+        with:
+          token: ${{ secrets.GH_TOKEN }}

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2026-03-12"
+channel = "nightly"
 profile = "default"
 components = ["rust-analyzer"]