chore: update workflow (add caching)

.github/workflows/build-test-fmt.yml

@@ -3,28 +3,19 @@ name: Build-Test-Fmt
 on: [push, pull_request]
 
 jobs:
-  build:
+  build-test-fmt:
     runs-on: ubuntu-latest
     
     steps:
     - uses: actions/checkout@v3
+    - run: rustup toolchain install stable --profile minimal
+    - uses: Swatinem/rust-cache@v2
+    
     - name: Build
       run: cargo build
-
-  test:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Run tests
+      
+    - name: Test
       run: cargo test
-  
-  fmt:
-    runs-on: ubuntu-latest
-    
-    steps:
-    - uses: actions/checkout@v3
-    - name: Run clippy
-      run: cargo clippy
-    - name: Run fmt check
+      
+    - name: Fmt
       run: cargo fmt -- --check