Try appveyor for MSI (not finished)

appveyor.yml

@@ -0,0 +1,23 @@
+version: '{build}'
+pull_requests:
+  do_not_increment_build_number: true
+os: Visual Studio 2017
+shallow_clone: true
+clone_depth: 1
+
+environment:
+  MSYS2_PATH_TYPE: inherit
+  CHERE_INVOKING: enabled_from_arguments
+
+install:
+- c:\msys64\usr\bin\bash -lc "pacman --noconfirm -S curl unzip"
+
+build_script:
+- cmd: >-
+    cd \projects\yggdrasil-go
+- c:\msys64\usr\bin\bash -lc "./build.bat"
+
+test: off
+
+artifacts:
+- path: 'yggdrasil-*.msi'