Add project official docker image.

Tag for docker image is set from project version.
To build docker image for the project run:
- mvn package
- mvn -N dockerfile:build

Created docker image can be uploaded to the docker hub:
- mvn -N dockerfile:push

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

.dockerignore

@@ -0,0 +1,15 @@
+*.md
+*.xml
+*.yml
+*.txt
+*.html
+
+.gitignore
+.git/
+contrib/
+airsonic-main/
+!airsonic-main/target/airsonic.war
+subsonic-rest-api/
+airsonic-sonos-api/
+repo/
+target/

Dockerfile

@@ -0,0 +1,27 @@
+FROM alpine:3.6
+
+LABEL description="Airsonic is a free, web-based media streamer, providing ubiquitious access to your music." \
+      url="https://github.com/airsonic/airsonic"
+
+ENV UID=1001 GID=1001 AIRSONIC_PORT=4040 AIRSONIC_DIR=/airsonic
+
+WORKDIR $AIRSONIC_DIR
+
+COPY dockerfiles/run.sh /usr/local/bin/run.sh
+COPY airsonic-main/target/airsonic.war airsonic.war
+
+RUN apk --no-cache add \
+    ffmpeg \
+    lame \
+    su-exec \
+    libressl \
+    ca-certificates \
+    tini \
+    openjdk8-jre \
+    && chmod +x /usr/local/bin/run.sh
+
+EXPOSE $AIRSONIC_PORT
+
+VOLUME $AIRSONIC_DIR/data $AIRSONIC_DIR/music $AIRSONIC_DIR/playlists $AIRSONIC_DIR/podcasts
+
+ENTRYPOINT ["run.sh"]

dockerfiles/run.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+mkdir -p $AIRSONIC_DIR/data/transcode
+ln -s /usr/bin/ffmpeg $AIRSONIC_DIR/data/transcode/ffmpeg
+ln -s /usr/bin/lame $AIRSONIC_DIR/data/transcode/lame
+
+chown -R $UID:$GID $AIRSONIC_DIR/data $AIRSONIC_DIR/playlists $AIRSONIC_DIR/podcasts
+
+exec su-exec $UID:$GID tini -- \
+     java -Xmx256m \
+     -Dserver.host=0.0.0.0 \
+     -Dserver.port=$AIRSONIC_PORT \
+     -Dserver.contextPath=/ \
+     -Dairsonic.home=$AIRSONIC_DIR/data \
+     -Dairsonic.defaultMusicFolder=$AIRSONIC_DIR/musics \
+     -Dairsonic.defaultPodcastFolder=$AIRSONIC_DIR/podcasts \
+     -Dairsonic.defaultPlaylistFolder=$AIRSONIC_DIR/playlists \
+     -Djava.awt.headless=true \
+     -jar airsonic.war

pom.xml

@@ -169,6 +169,16 @@
                         </execution>
                     </executions>
                 </plugin>
+                <plugin>
+                    <groupId>com.spotify</groupId>
+                    <artifactId>dockerfile-maven-plugin</artifactId>
+                    <version>1.3.4</version>
+                    <inherited>false</inherited>
+                    <configuration>
+                        <repository>airsonic/airsonic</repository>
+                        <tag>${project.version}</tag>
+                    </configuration>
+                </plugin>
             </plugins>
         </pluginManagement>