feat(flake8): install linter

Update ruby, node and use alpine base image

.ruby-version

@@ -1 +1 @@
-2.4.1
+2.4.7

Dockerfile

@@ -1,31 +1,17 @@
-FROM ruby:2.4.1
+FROM ruby:2.4.7-alpine3.10
 
-RUN apt-get update && apt-get install -y apt-transport-https \
-  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-# Add node source
-RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
-RUN echo 'deb https://deb.nodesource.com/node_8.x jessie main' > /etc/apt/sources.list.d/nodesource.list
-RUN echo 'deb-src https://deb.nodesource.com/node_8.x jessie main' >> /etc/apt/sources.list.d/nodesource.list
-
-# Add yarn source
-RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
-RUN echo 'deb https://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  locales \
+RUN apk add \
+  python3 \
   nodejs \
   yarn \
-  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-RUN localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
-ENV LANG en_US.UTF-8
-ENV LANGUAGE en_US.UTF-8
-ENV LC_ALL en_US.UTF-8
+  alpine-sdk
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
+COPY requirements.txt /usr/src/app
+RUN pip3 install -r requirements.txt
+
 COPY Gemfile /usr/src/app/
 COPY Gemfile.lock /usr/src/app/
 RUN bundle install

Gemfile

@@ -1,7 +1,5 @@
 source "https://rubygems.org"
 
-ruby "2.4.1"
-
 gem "flog"
 gem "haml_lint"
 gem "rake"

package.json

@@ -2,9 +2,6 @@
   "name": "linters",
   "version": "1.0.0",
   "description": "Use Node for JS based linters",
-  "engines": {
-    "node": "^8.4.0"
-  },
   "dependencies": {
     "babel-eslint": "^8.0.1",
     "coffeelint": "^1.15.7",

requirements.txt

@@ -1 +1 @@
-flake8==3.3.0
+flake8==3.7.8