Various cleanup

Chang base image to openjdk:alpine
Update ScalaStyle from 0.6.0 -> 1.0.0

Author: nicosuave

Dockerfile

@@ -1,21 +1,18 @@
-FROM java
+FROM openjdk:alpine
 
 LABEL maintainer "Jeff Sippel <[email protected]>"
 
-RUN apt-get update
-RUN apt-get install -y ruby ruby-nokogiri
+RUN apk update && \
+  apk upgrade && \
+  apk add --no-cache ruby ruby-nokogiri ruby-json
 
-RUN adduser -u 9000 --disabled-password --quiet --gecos "" app
+RUN addgroup -g 9000 -S code && \
+  adduser -S -G code app
 USER app
 
-WORKDIR /usr/src/app
-
-COPY scalastyle_config.xml /usr/src/app/
-COPY scalastyle_2.11-0.6.0-batch.jar /usr/src/app/
-
 COPY . /usr/src/app
 
-VOLUME /code
 WORKDIR /code
+VOLUME /code
 
 CMD ["/usr/src/app/bin/scalastyle"]

lib/cc/engine/scalastyle.rb

@@ -12,7 +12,7 @@ def initialize(directory: , io: , engine_config: )
 
       def run
         exec_scalastyle_with_options
-        
+
         Dir.chdir(@directory) do
           next unless results
           results.xpath('//file').each do |file|
@@ -57,7 +57,7 @@ def analysis_files
       end
 
       def scalastyle_jar
-        '/usr/src/app/scalastyle_2.11-0.6.0-batch.jar'
+        '/usr/src/app/scalastyle_2.12-1.0.0-batch.jar'
       end
 
       def scalastyle_config
@@ -80,7 +80,7 @@ def results
           @results ||= Nokogiri::XML(File.read(results_xml_file_path))
         end
       end
-      
+
     end
   end
 end