add rust cache

Author: askuric

.github/workflows/rust.yml

@@ -30,7 +30,18 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2  
+      - name: Cache Cargo Dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            cargo-${{ runner.os }}-
+      
       - name: Install Rust toolchain
         uses: actions-rs/toolchain@v1
         with: