Fix CI cache

Use CCache for saving and restoring compilation cache across runs instead of copying the build folder.

.github/workflows/ci.yml

@@ -15,6 +15,12 @@ jobs:
         with:
           submodules: recursive
           
+                      
+      - name: Restore CCache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 2Gi
+
       - name: Restore Gradle Cache
         uses: actions/cache@v3
         with:
@@ -25,17 +31,6 @@ jobs:
             ${{ runner.os }}-gradle-${{ hashFiles('**/build.gradle') }}-
             ${{ runner.os }}-gradle-
 
-      - name: Restore CXX Cache
-        uses: actions/cache@v3
-        with:
-          path: |
-            app/.cxx/
-            app/build/intermediates/cxx/
-          key: ${{ runner.os }}-cxx-${{ hashFiles('app/**/CMakeLists.txt') }}-${{ hashFiles('app/**/*.h', 'app/**/*.hpp', 'app/**/*.cpp', 'app/**/*.S') }}
-          restore-keys: |
-            ${{ runner.os }}-cxx-${{ hashFiles('app/**/CMakeLists.txt') }}-
-            ${{ runner.os }}-cxx-
-
       - name: Install Ninja Build
         run: |
           sudo apt-get install -y ninja-build
@@ -56,6 +51,9 @@ jobs:
           SIGNING_STORE_PASSWORD: ${{ secrets.SIGNING_STORE_PASSWORD }}
           SIGNING_KEY_ALIAS: ${{ secrets.SIGNING_KEY_ALIAS }}
           SIGNING_KEY_PASSWORD: ${{ secrets.SIGNING_KEY_PASSWORD }}
+          CMAKE_C_COMPILER_LAUNCHER: "ccache"          
+          CMAKE_CXX_COMPILER_LAUNCHER: "ccache"
+          CCACHE_NOCOMPRESS: "true"
         run: ./gradlew --stacktrace --configuration-cache --build-cache --parallel --configure-on-demand assemble
 
       - name: Rename APKs (Signed)