Fix tini signal forwarding in docker containers.

Previous: 'sh' starts as the child process of 'tini', but 'sh' does
          not forward signals to its children.

Now: 'sh' is called with 'exec' which replaces the shell process
     by the java process.

Signed-off-by: Yufei Cai <yufei.cai@bosch.io>
Signed-off-by: Thomas Jaeckle <thomas.jaeckle@bosch.io>

dockerfile-release

@@ -46,4 +46,4 @@ RUN set -x \
 USER ditto
 WORKDIR $DITTO_HOME
 ENTRYPOINT ["/usr/bin/tini", "--"]
-CMD ["java", "${JVM_CMD_ARGS_ENV}", "${MAIN_CLASS_ENV}"]
+CMD ["sh", "-c", "exec java ${JVM_CMD_ARGS_ENV} ${MAIN_CLASS_ENV}"]

dockerfile-snapshot

@@ -43,6 +43,6 @@ RUN set -x \
 USER ditto
 WORKDIR $DITTO_HOME
 ENTRYPOINT ["/usr/bin/tini", "--"]
-CMD ["java", "${JVM_CMD_ARGS_ENV}", "${MAIN_CLASS_ENV}"]
+CMD ["sh", "-c", "exec java ${JVM_CMD_ARGS_ENV} ${MAIN_CLASS_ENV}"]
 
 COPY ${TARGET_DIR}/${SERVICE_STARTER}-${SERVICE_VERSION}-allinone.jar $DITTO_HOME

dockerfile-snapshot-arm64

@@ -43,6 +43,6 @@ RUN set -x \
 USER ditto
 WORKDIR $DITTO_HOME
 ENTRYPOINT ["/usr/bin/tini", "--"]
-CMD ["java", "${JVM_CMD_ARGS_ENV}", "${MAIN_CLASS_ENV}"]
+CMD ["sh", "-c", "exec java ${JVM_CMD_ARGS_ENV} ${MAIN_CLASS_ENV}"]
 
 COPY ${TARGET_DIR}/${SERVICE_STARTER}-${SERVICE_VERSION}-allinone.jar $DITTO_HOME