ci: Store EVMC package on AppVeyor

appveyor.yml

@@ -23,12 +23,12 @@ before_build:
   - if "%VS%" == "2017" (call "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\Common7\Tools\vsdevcmd" -arch=amd64)
   - if "%VS%" == "2017-32bit" (call "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\Common7\Tools\vsdevcmd" -arch=x86)
   - if "%VS%" == "2015" (call "%ProgramFiles(x86)%\Microsoft Visual Studio 14.0\VC\vcvarsall" x64)
-  - if defined VS cmake -S . -B build -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=C:\install -DTOOLCHAIN=cxx17-pic -DEVMC_TESTING=ON
+  - if defined VS cmake -S . -B build -G Ninja -Wno-dev -DTOOLCHAIN=cxx17-pic -DEVMC_TESTING=ON
 
 build_script:
 - ps: >-
     if ($env:VS) {
-      cmake --build build --target install
+      cmake --build build --target package
     }
     elseif ($env:GO) {
       $env:PATH = "C:\msys64\mingw64\bin;$env:PATH"
@@ -55,3 +55,7 @@ after_build:
       cd build
       ctest -C $env:CONFIGURATION -j4 --schedule-random --output-on-failure
     }
+
+artifacts:
+  - path: build\evmc-*.*
+    name: package