ci: cache vcpkg binaries via files provider

Author: bobtista

.github/workflows/build-toolchain.yml

@@ -32,12 +32,21 @@ jobs:
     runs-on: windows-2022
     timeout-minutes: 40
     env:
-      VCPKG_BINARY_SOURCES: clear;x-gha,readwrite
+      VCPKG_FILE_CACHE: ${{ github.workspace }}\vcpkg-bincache
+      VCPKG_BINARY_SOURCES: clear;files,${{ env.VCPKG_FILE_CACHE }},readwrite
       VCPKG_FEATURE_FLAGS: manifests,versions,binarycaching
     steps:
       - name: Checkout Code
         uses: actions/checkout@v4
 
+      - name: Cache vcpkg binary artifacts
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.VCPKG_FILE_CACHE }}
+          key: vcpkg-bincache-${{ runner.os }}-${{ hashFiles('vcpkg.json','vcpkg-lock.json') }}
+          restore-keys: |
+            vcpkg-bincache-${{ runner.os }}-
+
       - name: Cache VC6 Installation
         if: startsWith(inputs.preset, 'vc6')
         id: cache-vc6