ci: Add cache (#14)

* ci: Add cache

* ci: Add audit-else

.github/workflows/audit-else.yml

@@ -0,0 +1,15 @@
+name: Security audit
+
+on:
+  pull_request:
+    paths-ignore:
+      - "**/deny.toml"
+      - "**/Cargo.toml"
+      - "**/Cargo.lock"
+
+jobs:
+  security_audit:
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          echo "Nothing to do"

.github/workflows/rust.yml

@@ -19,6 +19,16 @@ jobs:
         os: [macos-latest, ubuntu-latest, windows-latest]
 
     steps:
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
       - uses: actions/checkout@v3
       - uses: lukka/get-cmake@latest