Add Dockerfile for experiment

docker/Dockerfile

@@ -0,0 +1,6 @@
+FROM alpine:3.6
+RUN apk add --no-cache git gcc make bison ruby musl-dev
+RUN git clone --depth 1 https://github.com/mruby/mruby.git
+RUN git clone --depth 1 https://github.com/ksss/mruby-spec.git
+RUN mkdir -p /mruby-spec/unsupported/signal
+RUN echo "Signal.list doesn't contain other signals than the known list" > /mruby-spec/unsupported/signal/list.txt

docker/build_config.rb

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+MRuby::Build.new do |conf|
+  toolchain :gcc
+  enable_debug
+  conf.gembox 'full-core'
+end
+MRuby::Build.new('test') do |conf|
+  toolchain :gcc
+  enable_debug
+  conf.gembox 'full-core'
+  conf.enable_bintest
+  conf.enable_test
+  conf.gem "/mruby-signal"
+end

docker/docker-compose.yml

@@ -0,0 +1,11 @@
+version: "2"
+services:
+  test:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ../:/mruby-signal
+    working_dir: /mruby
+    environment:
+      MRUBY_CONFIG: /mruby-signal/docker/build_config.rb