Added Github cache action

Author: ikhvorost

.github/workflows/swift.yml

@@ -11,6 +11,11 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - uses: actions/cache@v3
+      with:
+        path: .build
+        key: ${{ runner.os }}-spm-${{ hashFiles('Package.resolved') }}
+    
     - name: Xcode 15
       run: sudo xcode-select -s '/Applications/Xcode_15.2.app/Contents/Developer'