use ccache on linux CI

Author: servantftransperfect

.github/workflows/build-linux.yml

@@ -18,6 +18,12 @@ jobs:
     steps:
       - uses: actions/checkout@v1
 
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ github.job }}-${{ runner.os }}
+          max-size: "1000M"
+
       - name: Prepare File Tree
         run: |
           mkdir ./build
@@ -30,6 +36,8 @@ jobs:
         run: |
           cmake .. \
            -G Ninja \
+           -DCMAKE_C_COMPILER_LAUNCHER=ccache \
+           -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
            -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
            -DBUILD_SHARED_LIBS=ON \
            -DCMAKE_PREFIX_PATH="${DEPS_INSTALL_DIR}" \