Add tini to java 21 Dockerfile

java/21/Dockerfile

@@ -17,7 +17,8 @@ RUN         apt update -y \
                 fontconfig \
                 tzdata \
                 iproute2 \
-					libfreetype6
+                libfreetype6 \
+                tini
 
 ## Setup user and working directory
 RUN         useradd -m -d /home/container -s /bin/bash container
@@ -25,5 +26,9 @@ USER        container
 ENV         USER=container HOME=/home/container
 WORKDIR     /home/container
 
-COPY        ./../entrypoint.sh /entrypoint.sh
-CMD         [ "/bin/bash", "/entrypoint.sh" ]
+STOPSIGNAL SIGINT
+
+COPY        --chown=container:container ./../entrypoint.sh /entrypoint.sh
+RUN         chmod +x /entrypoint.sh
+ENTRYPOINT    ["/usr/bin/tini", "-g", "--"]
+CMD         ["/entrypoint.sh"]