Provide logback config for JSON logging to STDOUT

Signed-off-by: nscuro <[email protected]>

src/main/docker/Dockerfile

@@ -53,7 +53,7 @@ RUN mkdir -p ${APP_DIR} ${DATA_DIR} \
 COPY --from=jre-build /opt/java/openjdk $JAVA_HOME
 
 # Copy the compiled WAR to the application directory created above
-COPY ./target/${WAR_FILENAME} ${APP_DIR}
+COPY ./target/${WAR_FILENAME} ./src/main/docker/logback-json.xml ${APP_DIR}
 
 # Specify the user to run as (in numeric format for compatibility with Kubernetes/OpenShift's SCC)
 USER ${UID}

src/main/docker/logback-json.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true">
+    <appender name="JSON_STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder class="net.logstash.logback.encoder.LogstashEncoder"/>
+    </appender>
+
+    <logger name="alpine" level="${dependencyTrack.logging.level:-INFO}" additivity="false">
+        <appender-ref ref="JSON_STDOUT" />
+    </logger>
+
+    <logger name="org.dependencytrack" level="${dependencyTrack.logging.level:-INFO}" additivity="false">
+        <appender-ref ref="JSON_STDOUT" />
+    </logger>
+
+    <logger name="org.eclipse.jetty" level="${dependencyTrack.logging.level:-INFO}" additivity="false">
+        <appender-ref ref="JSON_STDOUT" />
+    </logger>
+
+    <root level="WARN">
+        <appender-ref ref="JSON_STDOUT" />
+    </root>
+</configuration>