Fixed the vesion of sonarqube and postgres images; updated alpine and added README.

Author: mwz

README.md

@@ -0,0 +1,24 @@
+# sonarqube-scala-docker
+A docker-compose recipe for out-of-the-box [SonarQube LTS](https://www.sonarqube.org) instance with support for [Scala](http://www.scala-lang.org), [Scoverage](https://github.com/scoverage/scalac-scoverage-plugin) (code coverage metrics) and [Scalastyle](http://www.scalastyle.org) + [Scapegoat](https://github.com/sksamuel/scapegoat) (static code analysis). :sunglasses:
+
+
+## Usage
+To start SonarQube in a daemon mode, simply run:
+
+```bash
+docker-compose up -d
+```
+
+Once docker pulls all the required images and starts up the containers, the application should become available on [http://localhost](http://localhost). The default SonarQube login details for the Administrator account are `admin:admin`.
+
+
+## Dependencies
+ * [SonarQube 5.6.7 LTS](https://hub.docker.com/_/sonarqube)
+ * [PostgreSQL 9](https://hub.docker.com/_/postgres)
+ * External SonarQube plugins:
+   * [Sagacify/sonar-scala](https://github.com/Sagacify/sonar-scala) - provides support for scalastyle and scoverage.
+   * [arthepsy/sonar-scala-extra](https://github.com/arthepsy/sonar-scala-extra) - adds scapegoat inspections.
+
+
+## License
+The project is licensed under the Apache License v2. See the [LICENSE file](LICENSE) for more details.

docker-compose.yml

@@ -2,7 +2,7 @@ version: "2"
 
 services:
   sonarqube:
-    image: sonarqube:lts
+    image: sonarqube:5.6.7-alpine # lts
     ports:
       - "80:9000"
     networks:
@@ -13,7 +13,7 @@ services:
       - plugins
 
   db:
-    image: postgres
+    image: postgres:9 # sonarqube 5 isn't compatible with postgres 10
     networks:
       - sonarnet
     environment:

plugins/Dockerfile

@@ -1,6 +1,6 @@
-FROM alpine:3.4
+FROM alpine:3.6
 
-RUN apk --no-cache add --repository http://dl-cdn.alpinelinux.org/alpine/3.4/community wget ca-certificates
+RUN apk --no-cache add --repository http://dl-cdn.alpinelinux.org/alpine/3.6/community wget ca-certificates
 
 WORKDIR /tmp/sonarqube/plugins
 RUN wget https://github.com/Sagacify/sonar-scala/releases/download/v0.0.3/sonar-scala-plugin-0.0.3.jar