Add docker files.

Dockerfile

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+# Alpine Linux with OpenJDK JRE
+FROM openjdk:8-jre-alpine
+MAINTAINER Bertrik Sikken bertrik@gmail.com
+
+ADD ttnhabbridge/build/distributions/ttnhabbridge.tar /opt/
+
+WORKDIR /opt/ttnhabbridge
+ENTRYPOINT /opt/ttnhabbridge/bin/ttnhabbridge
+

docker/docker-compose.yaml

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+version: "3"
+services:
+  java:
+    build: ..
+    image: ghcr.io/bertrik/ttnhabbridge
+    restart: always
+    volumes:
+      - "./ttnhabbridge.yaml:/opt/ttnhabbridge/ttnhabbridge.yaml:ro"
+      - "./log4j.properties:/opt/ttnhabbridge/log4j.properties:ro"
+      - "./log:/opt/ttnhabbridge/log:rw"
+

docker/log4j.properties

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+# Root logger option
+log4j.rootLogger=INFO, stdout, file
+
+# Direct log messages to stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+#log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
+log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %-5p %c{1}:%L - %m%n
+
+# Direct log messages to file
+log4j.appender.file=org.apache.log4j.RollingFileAppender
+log4j.appender.file.File=log/ttnhabbridge.log
+log4j.appender.file.MaxFileSize=10MB
+log4j.appender.file.MaxBackupIndex=10
+log4j.appender.file.layout=org.apache.log4j.PatternLayout
+log4j.appender.file.layout.ConversionPattern=%d{ISO8601} %-5p %c{1}:%L - %m%n

docker/ttnhabbridge.yaml

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+---
+thethingsnetwork:
+  url: "tcp://eu1.cloud.thethings.network"
+  user: "appname"
+  pass: "NNSXS.SIY7VBOR2KTIDBJY7QVTILSORMGIEQ63YNDNBIY.SECRET"
+  topic: "v3/+/devices/+/up"
+helium:
+  url: ""
+  user: "user"
+  pass: "pass"
+  topic: "helium/+/rx"
+habitat:
+  url: "http://habitat.habhub.org"
+  timeout: 60
+gwCacheExpirationTime: 600
+payloadEncoding: "cayenne"