Add ccache to CI (#375)

.github/workflows/run-java-test.yaml

@@ -39,10 +39,15 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}
+
       - name: Display java version
         shell: bash
         run: |
@@ -52,5 +57,9 @@ jobs:
       - name:  Run java test
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           cd ./java-api-examples
           ./runtest.sh