ci/win32: use ccache

.github/workflows/build.yml

@@ -90,11 +90,14 @@ jobs:
     runs-on: windows-latest
     env:
       VS: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise"
-      CC: "clang"
-      CXX: "clang++"
+      CC: "ccache clang"
+      CXX: "ccache clang++"
       CC_LD: "lld"
       CXX_LD: "lld"
       WINDRES: "llvm-rc"
+      CCACHE_BASEDIR: ${{ github.workspace }}
+      CCACHE_DIR: "${{ github.workspace }}\\.ccache"
+      CCACHE_MAXSIZE: 500M
     steps:
       - name: Disable autocrlf
         run: |
@@ -103,6 +106,17 @@ jobs:
 
       - uses: actions/checkout@v4
 
+      - name: Get time
+        id: get_time
+        run: |
+          "timestamp=$((Get-Date).Ticks)" >> $env:GITHUB_OUTPUT
+
+      - uses: actions/cache@v4
+        with:
+          path: ${{ env.CCACHE_DIR }}
+          key: x86_64-windows-msvc-${{ steps.get_time.outputs.timestamp }}
+          restore-keys: x86_64-windows-msvc-
+
       # https://github.com/mesonbuild/meson/pull/11715
       - name: Install dependencies
         run: |
@@ -110,6 +124,7 @@ jobs:
           python -m pip install build wheel
           python -m build --wheel --no-isolation meson
           python -m pip install (Get-Item ./meson/dist/meson-*-py3-none-any.whl).FullName
+          choco install ccache
 
       - name: Update Meson WrapDB
         run: |