Corrected some Docker build warnings.

Signed-off-by: Hermann Mayer <[email protected]>

3.7/Dockerfile

@@ -1,5 +1,5 @@
 FROM apache/kafka:3.7.0
-MAINTAINER Hermann Mayer "hermann.mayer@hausgold.de"
+LABEL org.opencontainers.image.authors="containers@hausgold.de"
 
 # You can change this environment variable on run's with -e
 ENV MDNS_HOSTNAME=kafka.local
@@ -24,4 +24,4 @@ RUN chmod +x /usr/local/bin/*
 COPY config/supervisor/* /etc/supervisor/conf.d/
 
 # Define the command to run per default
-CMD /usr/bin/supervisord -nc /etc/supervisord.conf
+CMD ["/usr/bin/supervisord", "-nc", "/etc/supervisord.conf"]