enable github actions

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+name: build
+on: [pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        mruby_version: ["3.0.0", "2.1.2"]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install packages
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get -qq install rake bison git gperf
+      - name: Test
+        run: MRUBY_VERSION=${{ matrix.mruby_version }} rake test
+

.gitignore

@@ -0,0 +1,2 @@
+mruby/
+build_config.rb.lock

Rakefile

@@ -0,0 +1,31 @@
+MRUBY_CONFIG=File.expand_path(ENV["MRUBY_CONFIG"] || "build_config.rb")
+MRUBY_VERSION=ENV["MRUBY_VERSION"] || "3.0.0"
+
+file :mruby do
+  sh "git clone --depth=1 git://github.com/mruby/mruby.git"
+  if MRUBY_VERSION != 'master'
+    Dir.chdir 'mruby' do
+      sh "git fetch --tags"
+      rev = %x{git rev-parse #{MRUBY_VERSION}}
+      sh "git checkout #{rev}"
+    end
+  end
+end
+
+desc "compile binary"
+task :compile => :mruby do
+  sh "cd mruby && rake all MRUBY_CONFIG=#{MRUBY_CONFIG}"
+end
+
+desc "test"
+task :test => :mruby do
+  sh "cd mruby && rake all test MRUBY_CONFIG=#{MRUBY_CONFIG}"
+end
+
+desc "cleanup"
+task :clean do
+  exit 0 unless File.directory?('mruby')
+  sh "cd mruby && rake deep_clean"
+end
+
+task :default => :compile

build_config.rb

@@ -6,6 +6,7 @@
   end
 
   conf.enable_debug
+  conf.enable_test
 
   conf.cc.flags << '-DMRB_INT64'