Update build to use ubuntu 16.04

Author: jllopes

build.sbt

@@ -24,27 +24,30 @@ version in Docker := "1.0"
 organization := "com.codacy"
 
 val installAll =
-  s"""echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories &&
-     |apk --no-cache add bash wget ca-certificates git &&
-     |apk --no-cache add python &&
-     |apk --no-cache add 'python3>3.6.1' &&
-     |wget "https://bootstrap.pypa.io/get-pip.py" -O /dev/stdout | python &&
-     |wget "https://bootstrap.pypa.io/get-pip.py" -O /dev/stdout | python3 &&
-     |python -m pip install django==1.9.2 pylint-django==0.9.0 flask==0.10.1 pylint-flask==0.1 flask-wtf==0.12 --upgrade --ignore-installed --no-cache-dir &&
-     |python3 -m pip install django==1.9.2 pylint-django==0.9.0 flask==0.10.1  pylint-flask==0.1 flask-wtf==0.12 --upgrade --ignore-installed --no-cache-dir &&
-     |python -m pip install pylint-common==0.2.2 &&
-     |python3 -m pip install pylint-common==0.2.2 &&
-     |python -m pip install pylint-celery==0.3 &&
-     |python3 -m pip install pylint-celery==0.3 &&
-     |python -m pip install SaltPyLint==2017.12.15 &&
-     |python3 -m pip install SaltPyLint==2017.12.15 &&
-     |python -m pip install pylint==1.8.2 --upgrade --ignore-installed --no-cache-dir &&
-     |python3 -m pip install pylint==1.8.2 --upgrade --ignore-installed --no-cache-dir &&
-     |python -m pip uninstall -y pip &&
-     |python3 -m pip uninstall -y pip &&
-     |apk del wget ca-certificates git &&
-     |rm -rf /tmp/* &&
-     |rm -rf /var/cache/apk/*""".stripMargin.replaceAll(System.lineSeparator(), " ")
+  s"""apt-get update &&
+      |apt-get -y install python python3 ca-certificates wget openjdk-8-jre-headless &&
+      |wget "https://bootstrap.pypa.io/get-pip.py" -O /dev/stdout | python &&
+      |wget "https://bootstrap.pypa.io/get-pip.py" -O /dev/stdout | python3 && 
+      |python -m pip install django==1.9.2 pylint-django==0.9.0 flask==0.10.1 pylint-flask==0.1 flask-wtf==0.12 --upgrade --ignore-installed --no-cache-dir &&
+      |python3 -m pip install django==1.9.2 pylint-django==0.9.0 flask==0.10.1 pylint-flask==0.1 flask-wtf==0.12 --upgrade --ignore-installed --no-cache-dir &&
+      |python -m pip install pylint-common==0.2.2 &&
+      |python3 -m pip install pylint-common==0.2.2 &&
+      |python -m pip install pylint-celery==0.3 &&
+      |python3 -m pip install pylint-celery==0.3 &&
+      |python -m pip install SaltPyLint==2017.12.15 &&
+      |python3 -m pip install SaltPyLint==2017.12.15 &&
+      |python -m pip install pylint==1.8.2 --upgrade --ignore-installed --no-cache-dir &&
+      |python3 -m pip install pylint==1.8.2 --upgrade --ignore-installed --no-cache-dir &&
+      |python -m pip uninstall -y pip &&
+      |python3 -m pip uninstall -y pip &&
+      |apt-get clean &&
+      |rm -rf /var/lib/apt/lists/* &&
+      |rm -rf /root/.cache/pip &&
+      |rm -rf /root/.pip/cache &&
+      |rm -rf /var/lib/apt/lists/* &&
+      |rm -rf /var/cache/apt &&
+      |rm -rf /var/cache/oracle-jdk8-installer &&
+      |rm -rf /tmp/*""".stripMargin.replaceAll(System.lineSeparator(), " ")
 
 mappings in Universal <++= (resourceDirectory in Compile) map { (resourceDir: File) =>
   val src = resourceDir / "docs"
@@ -63,15 +66,15 @@ daemonUser in Docker := dockerUser
 
 daemonGroup in Docker := dockerGroup
 
-dockerBaseImage := "develar/java"
+dockerBaseImage := "ubuntu:16.04"
 
 dockerCommands := dockerCommands.value.flatMap {
   case cmd@Cmd("WORKDIR", _) => List(cmd,
     Cmd("RUN", installAll)
   )
   case cmd@(Cmd("ADD", "opt /opt")) => List(cmd,
     Cmd("RUN", "mv /opt/docker/docs /docs"),
-    Cmd("RUN", s"adduser -u 2004 -D $dockerUser"),
+    Cmd("RUN", "adduser --uid 2004 --disabled-password --gecos \"\" docker"),
     ExecCmd("RUN", Seq("chown", "-R", s"$dockerUser:$dockerGroup", "/docs"): _*)
   )
   case other => List(other)