implemented docker image build fix from it-at-m/refarch-templates#802

Author: tobiasholler

captchaservice-backend/pom.xml

@@ -430,6 +430,7 @@
                 <configuration>
                     <effort>Max</effort>
                     <excludeFilterFile>spotbugs-exclude-rules.xml</excludeFilterFile>
+                    <spotbugsXmlOutputDirectory>${project.build.directory}/spotbugs-results</spotbugsXmlOutputDirectory> <!-- required to ensure only the artifact jar is on top level when building -->
                     <plugins>
                         <plugin>
                             <groupId>com.h3xstream.findsecbugs</groupId>