Cache cargo registry

Author: kuy

.github/workflows/ci.yml

@@ -15,11 +15,11 @@ jobs:
           toolchain: stable
           profile: minimal
           override: true
-      - name: Cache cargo index
+      - name: Cache cargo registry
         uses: actions/cache@v2
         with:
-          path: ~/.cargo/git
-          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
       - name: Cache cargo build
         uses: actions/cache@v2
         with: