Common: lint mruby and fix Ruby CI

.cirrus.yml

@@ -50,7 +50,7 @@ ruby_freebsd_task:
     - sudo make install
   ruby_build_script:
     - cd pkgs/ruby
-    - bundle install
+    - ./bin/setup
     - bundle exec rake compile
   ruby_test_script:
     - cd pkgs/ruby

.github/workflows/mruby.yml

@@ -13,6 +13,9 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.0
       - name: dependencies
         run: sudo apt-get --yes install cppcheck rake
       - name: autogen
@@ -26,6 +29,12 @@ jobs:
       - working-directory: vendor/mruby
         name: test
         run: MRUBY_CONFIG=../../pkgs/mruby/build_config.rb rake test
+      - working-directory: pkgs/mruby
+        name: setup
+        run: ./bin/setup
+      - working-directory: pkgs/mruby
+        name: lint
+        run: rake
       - working-directory: pkgs/mruby
         name: cppcheck
         run: cppcheck --quiet --error-exitcode=1 --std=c99 --enable=warning,style,performance,portability .

.github/workflows/ruby.yml

@@ -25,8 +25,8 @@ jobs:
       - name: install
         run: sudo make install
       - working-directory: pkgs/ruby
-        name: bundle
-        run: bundle install
+        name: setup
+        run: ./bin/setup
       - working-directory: pkgs/ruby
         name: compile
         run: rake compile

pkgs/mruby/.rubocop.yml

@@ -3,7 +3,8 @@ require:
   - rubocop-rake
 
 AllCops:
-  TargetRubyVersion: 3.0
+  # TODO: Explore which exact syntax version mruby is compatible with
+  TargetRubyVersion: 2.7
   DisplayCopNames: true
   NewCops: enable