Add extra logging, make builds use BUILDKIT and make the container more secure by using a different user

.gitlab-ci.yml

@@ -8,6 +8,7 @@ stages:
 variables:
   IMAGE_TAG: $CI_REGISTRY_IMAGE:latest
   NAME: $CI_PROJECT_NAME
+  DOCKER_BUILDKIT: 1
 
 build_and_push:
   stage: build

Dockerfile

@@ -10,4 +10,10 @@ FROM openjdk:8-jre-stretch
 
 COPY --from=build /app/build/libs/ottobot.jar /otto.jar
 
+RUN chmod 444 /otto.jar
+
+RUN useradd -r -u 1001 otto
+
+USER otto
+
 CMD java -jar /otto.jar

src/main/resources/logback.xml

@@ -6,7 +6,7 @@
     </appender>
 
 
-    <root level="INFO">
+    <root level="DEBUG">
         <appender-ref ref="STDOUT"/>
         <!--<appender-ref ref="FILE"/>-->
     </root>