Update Dockerfile

update to use contrast image copy and remove standalone appname.

Dockerfile

@@ -5,11 +5,11 @@ WORKDIR /spring-petclinic
 #Add application
 ADD ./spring-petclinic-1.5.1.jar /spring-petclinic/spring-petclinic-1.5.1.jar
 
-#Add Contrast
-ADD https://repository.sonatype.org/service/local/artifact/maven/redirect?r=central-proxy&g=com.contrastsecurity&a=contrast-agent&v=LATEST /opt/contrast/contrast.jar
+# Copy the required agent files from the official Contrast agent image.
+COPY --from=contrast/agent-java:latest /contrast/contrast-agent.jar /opt/contrast/contrast.jar
 
 #Enable Contrast
-ENV JAVA_TOOL_OPTIONS='-javaagent:/opt/contrast/contrast.jar -Dcontrast.application.name=spring-petclinic'
+ENV JAVA_TOOL_OPTIONS='-javaagent:/opt/contrast/contrast.jar'
 
 EXPOSE 8080
-ENTRYPOINT ["java", "-jar", "spring-petclinic-1.5.1.jar"]
+ENTRYPOINT ["java", "-jar", "spring-petclinic-1.5.1.jar"]