ci: add audit, test & coverage workflows

.github/workflows/audit.yaml

@@ -0,0 +1,27 @@
+name: Audit
+
+on: ["push", "pull_request"]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_TOOLCHAIN: 1.86.0
+
+jobs:
+  audit:
+    name: Audit
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
+
+      - name: Run security audit
+        run: cargo audit