Add lto cache to github action cache (#1518)

.github/workflows/core.yml

@@ -49,12 +49,15 @@ jobs:
         key: gradle-builds-core-${{ github.sha }}
         restore-keys: |
           gradle-builds
-    - name: Cache Ccache
+    - name: Cache native build
       uses: actions/cache@v2
       with:
-        path: ~/.ccache
-        key: ccache-cache-${{ github.sha }}
-        restore-keys: ccache-cache-
+        path: |
+          ~/.ccache
+          core/build/.lto-cache
+          daemon/build/.lto-cache
+        key: native-cache-${{ github.sha }}
+        restore-keys: native-cache-
     - name: Install ccache
       run: |
         sudo apt-get install -y ccache