Added a docker image with a local snapshot version of sonar-scala.

dev/Dockerfile

@@ -0,0 +1,17 @@
+# Alpine image with bundled Scala plugins
+# sonar-scala (https://github.com/mwz/sonar-scala)
+# and sonar-scala-extra (https://github.com/arthepsy/sonar-scala-extra),
+# which can be mounted as a volume into a SonarQube container.
+# This image is intended to be used for local development purposes.
+
+FROM alpine:3.7
+
+ARG SONAR_SCAPEGOAT_VERSION=1.3.0
+ARG SONAR_SCALA_VERSION
+
+RUN apk --no-cache add --repository http://dl-cdn.alpinelinux.org/alpine/v3.7/community wget ca-certificates
+
+WORKDIR /opt/sonarqube/extensions/plugins
+RUN wget -O "sonar-scapegoat-plugin-${SONAR_SCAPEGOAT_VERSION}.jar" \
+    "https://github.com/arthepsy/sonar-scala-extra/releases/download/v${SONAR_SCAPEGOAT_VERSION}/sonar-scapegoat-plugin-${SONAR_SCAPEGOAT_VERSION}.jar"
+ADD sonar-scala_2.12-assembly.jar .

dev/build.sh

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+#!/usr/bin/env bash
+set -eu
+
+export SONAR_SCALA_VERSION=6.2.0-SNAPSHOT
+cp ~/.ivy2/local/com.github.mwz/sonar-scala_2.12/${SONAR_SCALA_VERSION}/jars/sonar-scala_2.12-assembly.jar .
+docker build -t mwizner/sonarqube-scala-plugins:dev --build-arg SONAR_SCALA_VERSION=${SONAR_SCALA_VERSION} .