Enable pytest for appveyor (#5555)

- use vcpkg to install and build grpc
- use cache for grpc binaries
- execute tests using pytest

.appveyor.yml

@@ -1,19 +1,7 @@
 version: 1.0.{build}
-branches:
-  only:
-  - dev
 image: Visual Studio 2017
-clone_depth: 1
 environment:
   QT5: C:\Qt\5.13.2\msvc2017_64
+cache: C:\vcpkg
 build_script:
-- cmd: >-
-    mkdir cmakebuild
-
-    cd cmakebuild
-
-    if exist "%QT5%" set Path=%QT5%\bin;%Path%
-
-    cmake -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release -DRESINSIGHT_ENABLE_UNITY_BUILD=on -DRESINSIGHT_ENABLE_PRECOMPILED_HEADERS=on "-DCMAKE_PREFIX_PATH=%QT5%" ..
-
-    cmake --build . --target ResInsight --config Release
+- ps: .\appveyor-build.ps1

appveyor-build.ps1

@@ -0,0 +1,40 @@
+if ( ! (Test-Path -Path "C:/vcpkg") ) {
+  cd C:\
+  git clone -q https://github.com/Microsoft/vcpkg.git
+  cd .\vcpkg
+
+  # Checkout grpc v 1.19.1
+  # https://github.com/microsoft/vcpkg/commit/8b4a607c328d100ac9892e2cbcfb9a4b0cf44c10
+  git checkout -q 8b4a607c328d100ac9892e2cbcfb9a4b0cf44c10
+  .\bootstrap-vcpkg.bat
+
+  # Set instructions to vcpkb to build release only
+  Add-Content .\triplets\x64-windows.cmake "set(VCPKG_BUILD_TYPE release)"
+
+  # Install grpc
+  .\vcpkg.exe install grpc --triplet x64-windows
+}
+
+### Python
+$env:PATH = "C:\Python37;C:\Python37\Scripts;$env:PATH"
+
+python --version
+python -m pip install --upgrade pip
+python -m pip install grpcio-tools
+python -m pip install pytest
+
+$env:PATH = "$env:QT5\bin;$env:PATH"
+
+#### BUILD
+mkdir cmakebuild
+cd .\cmakebuild
+
+cmake -DCMAKE_BUILD_TYPE=Release -DRESINSIGHT_ENABLE_UNITY_BUILD=on -DRESINSIGHT_ENABLE_PRECOMPILED_HEADERS=on "-DCMAKE_PREFIX_PATH=$env:QT5" -DRESINSIGHT_ENABLE_GRPC=true -DRESINSIGHT_GRPC_PYTHON_EXECUTABLE=C:/Python37/python.exe -DCMAKE_TOOLCHAIN_FILE=C:\vcpkg\scripts\buildsystems\vcpkg.cmake -A x64 ..
+
+cmake --build . --target ResInsight --config Release
+
+### TEST
+$env:RESINSIGHT_EXECUTABLE="$env:APPVEYOR_BUILD_FOLDER/cmakebuild/ApplicationCode/Release/ResInsight.exe" 
+
+cd ../ApplicationCode/GrpcInterface/Python/rips
+python -m pytest --console