trying to cache vcpkg better on windows

Author: codethinki

.github/actions/setup-windows/action.yml

@@ -46,22 +46,46 @@ runs:
         restore-keys: |
           buildcache-windows-${{ inputs.compiler }}-
 
-    - name: Cache Custom Vcpkg
-      id: cache-vcpkg-custom
-      uses: actions/cache@v4
+    - name: Restore Custom Vcpkg
+      id: restore-vcpkg
+      uses: actions/cache/restore@v4
       with:
         path: c:\vcpkg-custom
-        key: vcpkg-custom-repo-windows
+        key: vcpkg-custom-repo-windows-restore-search
+        restore-keys: |
+            vcpkg-custom-repo-windows-
 
-    - name: Setup Vcpkg (Latest)
+    - name: Setup Vcpkg (Clone/Update)
       shell: pwsh
       run: |
-        if (!(Test-Path "c:\vcpkg-custom\.git")) {
-            git clone https://github.com/microsoft/vcpkg.git c:\vcpkg-custom
+        $vcpkgPath = "c:\vcpkg-custom"
+        if (!(Test-Path "$vcpkgPath\.git")) {
+            Write-Host "Cloning vcpkg..."
+            git clone https://github.com/microsoft/vcpkg.git $vcpkgPath
+        } else {
+            Write-Host "Fetching vcpkg updates..."
+            Push-Location $vcpkgPath
+            git fetch origin master
+            git pull origin master
+            Pop-Location
         }
-        & "c:\vcpkg-custom\bootstrap-vcpkg.bat" -disableMetrics
-        echo "VCPKG_ROOT=c:\vcpkg-custom" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-        echo "c:\vcpkg-custom" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        
+        Push-Location $vcpkgPath
+        $sha = git rev-parse HEAD
+        Pop-Location
+        "VCPKG_SHA=$sha" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
+        & "$vcpkgPath\bootstrap-vcpkg.bat" -disableMetrics
+        
+        echo "VCPKG_ROOT=$vcpkgPath" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+        echo "$vcpkgPath" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+    - name: Save Custom Vcpkg (New State)
+      if: steps.restore-vcpkg.outputs.cache-matched-key != format('vcpkg-custom-repo-windows-{0}', env.VCPKG_SHA)
+      uses: actions/cache/save@v4
+      with:
+        path: c:\vcpkg-custom
+        key: vcpkg-custom-repo-windows-${{ env.VCPKG_SHA }}
 
     - name: Install BuildCache
       shell: pwsh