Merge add build cache

Author: rekby

.github/workflows/rust-unit.yml

@@ -12,11 +12,24 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
+
     steps:
     - uses: actions/checkout@v2
       with:
         submodules: true
 
+    - name: Cache
+      uses: actions/cache@v3
+      with:
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/
+          ~/.cargo/git/db/
+          target/
+
     - name: Build
       run: cargo build --verbose --workspace
     - name: Run tests