message: ci: Add vcpkg tools cache
  This change avoids downloading of the cached vcpkg tools that could fail
  accidentally, and it makes CI task more robust.
diff: @@ -86,6 +86,7 @@ task:
  PATH: 'C:\jom;C:\Python39;C:\Python39\Scripts;C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin;%PATH%'
  PYTHONUTF8: 1
  CI_VCPKG_TAG: '2021.05.12'
  + VCPKG_DOWNLOADS: 'C:\Users\ContainerAdministrator\AppData\Local\vcpkg\downloads'
  VCPKG_DEFAULT_BINARY_CACHE: 'C:\Users\ContainerAdministrator\AppData\Local\vcpkg\archives'
  QT_DOWNLOAD_URL: 'https://download.qt.io/official_releases/qt/5.12/5.12.11/single/qt-everywhere-src-5.12.11.zip'
  QT_LOCAL_PATH: 'C:\qt-everywhere-src-5.12.11.zip'
  @@ -121,6 +122,12 @@ task:
  - ..\configure -release -silent -opensource -confirm-license -opengl desktop -no-shared -static -static-runtime -mp -qt-zlib -qt-pcre -qt-libpng -no-libjpeg -nomake examples -nomake tests -nomake tools -no-dbus -no-libudev -no-icu -no-gtk -no-opengles3 -no-angle -no-sql-sqlite -no-sql-odbc -no-sqlite -no-libudev -no-vulkan -skip qt3d -skip qtactiveqt -skip qtandroidextras -skip qtcanvas3d -skip qtcharts -skip qtconnectivity -skip qtdatavis3d -skip qtdeclarative -skip qtdoc -skip qtgamepad -skip qtgraphicaleffects -skip qtimageformats -skip qtlocation -skip qtmacextras -skip qtmultimedia -skip qtnetworkauth -skip qtpurchasing -skip qtquickcontrols -skip qtquickcontrols2 -skip qtscript -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtserialport -skip qtspeech -skip qtvirtualkeyboard -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtx11extras -skip qtxmlpatterns -no-openssl -no-feature-sql -no-feature-sqlmodel -prefix %QTBASEDIR%
  - jom
  - jom install
  + vcpkg_tools_cache:
  + folder: '%VCPKG_DOWNLOADS%\tools'
  + reupload_on_changes: false
  + fingerprint_script:
  + - echo %CI_VCPKG_TAG%
  + - msbuild -version
  vcpkg_binary_cache:
  folder: '%VCPKG_DEFAULT_BINARY_CACHE%'
  reupload_on_changes: true
  