ci: add caches

Author: grdsdev

.github/workflows/ci.yml

@@ -55,6 +55,14 @@ jobs:
           - { command: test, skip_release: 1 }
     steps:
       - uses: actions/checkout@v5
+      - name: Cache derived data
+        uses: actions/cache@v4
+        with:
+          path: ~/.derivedData
+          key: |
+            deriveddata-xcodebuild-${{ matrix.platform }}-${{ matrix.xcode }}-${{ matrix.command }}-${{ hashFiles('**/Sources/**/*.swift', '**/Tests/**/*.swift') }}
+          restore-keys: |
+            deriveddata-xcodebuild-${{ matrix.platform }}-${{ matrix.xcode }}-${{ matrix.command }}-
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: List available devices
@@ -171,6 +179,14 @@ jobs:
         xcode: ["16.3"]
     steps:
       - uses: actions/checkout@v5
+      - name: Cache derived data
+        uses: actions/cache@v4
+        with:
+          path: ~/.derivedData
+          key: |
+            deriveddata-library-evolution-${{ matrix.xcode }}-${{ hashFiles('**/Sources/**/*.swift', '**/Tests/**/*.swift') }}
+          restore-keys: |
+            deriveddata-library-evolution-${{ matrix.xcode }}-
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: Build for library evolution
@@ -207,5 +223,13 @@ jobs:
     runs-on: macos-15
     steps:
       - uses: actions/checkout@v5
+      - name: Cache Swift build
+        uses: actions/cache@v4
+        with:
+          path: .build
+          key: |
+            docs-${{ runner.os }}-${{ hashFiles('**/Package.resolved') }}
+          restore-keys: |
+            docs-${{ runner.os }}-
       - name: Test docs
         run: make test-docs