ci: Split vcpkg tools cache into restore/save

The vcpkg tools cache was using the combined actions/cache action,
which saves on every run regardless of branch. Split it into the
restore/save pattern used by the other caches, so that saves only
happen on default branch pushes.

.github/workflows/ci.yml

@@ -259,11 +259,13 @@ jobs:
         run: |
           echo "VCPKG_ROOT=${VCPKG_INSTALLATION_ROOT}" >> "$GITHUB_ENV"
 
-      - name: vcpkg tools cache
-        uses: actions/cache@v5
+      - name: Restore vcpkg tools cache
+        id: vcpkg-tools-cache
+        uses: actions/cache/restore@v5
         with:
           path: C:/vcpkg/downloads/tools
-          key: ${{ github.job }}-vcpkg-tools
+          key: ${{ github.job }}-vcpkg-tools-${{ github.run_id }}
+          restore-keys: ${{ github.job }}-vcpkg-tools-
 
       - name: Restore vcpkg binary cache
         uses: actions/cache/restore@v4
@@ -283,6 +285,13 @@ jobs:
           path: ~/AppData/Local/vcpkg/archives
           key: ${{ github.job }}-vcpkg-binary-${{ hashFiles('cmake_version', 'msbuild_version', 'toolset_version', 'vcpkg.json') }}
 
+      - name: Save vcpkg tools cache
+        uses: actions/cache/save@v5
+        if: github.event_name != 'pull_request' && github.ref_name == github.event.repository.default_branch && steps.vcpkg-tools-cache.outputs.cache-hit != 'true'
+        with:
+          path: C:/vcpkg/downloads/tools
+          key: ${{ github.job }}-vcpkg-tools-${{ github.run_id }}
+
       - name: Build
         run: |
           py -3 .github/ci-windows.py ${{ matrix.job-type }} build