[ci] appveyor improvements, test on a wider range of ruby versions

Gemfile

@@ -19,7 +19,11 @@ gem "fakefs", "1.8"
 # for file uploads with Faraday
 gem "mime-types", ['>= 1.16', '< 4.0']
 # Fast XML parser and object marshaller.
-gem "ox", "2.13.2"
+if RUBY_VERSION < '2.7.0'
+ gem "ox", "2.13.2"
+else
+ gem "ox", "2.14.16"
+end
 # Provides an interactive debugging environment for Ruby.
 gem "pry"
 # A plugin for pry that adds step-by-step debugging and stack navigation.

appveyor.yml

@@ -1,4 +1,5 @@
 # https://www.appveyor.com/docs/appveyor-yml/
+image: Visual Studio 2019
 
 version: "{build}"
 
@@ -20,12 +21,15 @@ skip_branch_with_pr: true
 init:
  - git config --global core.autocrlf true
 
+cache:
+ - .vendor/bundle
+
 # cloning the repository happens here
 
 install:
- - set PATH=C:\Ruby26-x64\bin;%PATH%
- - FOR /F "usebackq delims==" %%A IN (`ruby .ci/compatible_gem_version`) DO gem update --system %%A
- - FOR /F "usebackq delims==" %%A IN (`ruby .ci/bundler_version.rb`) DO gem install bundler -v %%A
+ - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
+ - bundle config --local path .vendor/bundle
+ - ridk install 3 # for ruby >= 3.1, we need the full compiler toolchain for gems with native extensions
  - bundle install
  # iconv
  - appveyor DownloadFile
@@ -37,6 +41,12 @@ environment:
  LC_ALL: en_US.UTF-8
  LANG: en_US.UTF-8
  FASTLANE_ITUNES_TRANSPORTER_PATH: C:/tmp
+ matrix:
+ - ruby_version: 26-x64
+ # - ruby_version: 27-x64
+ # - ruby_version: 30-x64 # disabled for now as we only have 1 concurent job
+ # - ruby_version: 31-x64
+ - ruby_version: 32-x64
 
 before_test:
  - ruby -v