CI: change cache key

.github/workflows/ci.yml

@@ -14,6 +14,15 @@ env:
   RUST_MIN_STACK: 8000000
 
 jobs:
+  fmt:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Fmt
+        run: cargo fmt --all --check
+
   build:
     runs-on: ubuntu-latest
 
@@ -24,7 +33,7 @@ jobs:
         id: cache-restore
         with:
           path: target
-          key: ubuntu-latest
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Install dependencies
         run: sudo apt install -y libboost-dev
@@ -36,9 +45,9 @@ jobs:
         id: cache-save
         with:
           path: target
-          key: ubuntu-latest
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
-  lint:
+  clippy:
     runs-on: ubuntu-latest
     needs: build
 
@@ -49,14 +58,11 @@ jobs:
         id: cache
         with:
           path: target
-          key: ubuntu-latest
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Clippy
         run: cargo clippy --workspace --all-targets --all-features -- -D warnings
 
-      - name: Fmt
-        run: cargo fmt --all --check
-
   tests:
     runs-on: ubuntu-latest
     needs: build
@@ -68,7 +74,7 @@ jobs:
         id: cache
         with:
           path: target
-          key: ubuntu-latest
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Test
         run: cargo test --all-features --workspace --all-targets && cargo test --all-features --workspace --doc