Oracle-xe docker container have weird behaviour

Question

I am new to docker I have been trying to install oracel-18xe in the docker after installing Oracele-xe which seems to be working but after running ./buildContainerImage.sh command I got the following logs.

Removing intermediate container 3cd9a901da82
 ---> 3ed5c215ef81
Step 7/8 : HEALTHCHECK --interval=1m --start-period=5m    CMD "$ORACLE_BASE/$CHECK_DB_FILE" >/dev/null || exit 1
 ---> Running in a1c6507ac3b9
Removing intermediate container a1c6507ac3b9
 ---> f48555c74740
Step 8/8 : CMD exec $ORACLE_BASE/$RUN_FILE
 ---> Running in c36aec16a658
Removing intermediate container c36aec16a658
 ---> a347238232be
Successfully built a347238232be
Successfully tagged oracle/database:18.4.0-xe

which seems correct, Then I run the command

sudo docker run --name myxedb     -d     -p 51521:1521     -p 55500:5500     -e ORACLE_PWD=<secret>     -e ORACLE_CHARACTERSET=AL32UTF8     oracle/database:18.4.0-xe

that runs with out error but after running docker logs command I found the following logs.

sed: can't read /etc/oratab: No such file or directory
/opt/oracle/runOracle.sh: line 194: /etc/init.d/oracle-xe-18c: No such file or directory
grep: /etc/oratab: No such file or directory
#####################################
########### E R R O R ###############
DATABASE SETUP WAS NOT SUCCESSFUL!
Please check output for further info!
########### E R R O R ###############
#####################################
The following output is now a tail of the alert.log:
/opt/oracle/checkDBStatus.sh: line 18: oraenv: No such file or directory
tail: cannot open '/opt/oracle/diag/rdbms/*/*/trace/alert*.log' for reading: No such file or directory
tail: no files remaining

but when I run docker ps command I have not found any container running then after googling I found an other variation the command

sudo docker run --name myxedb2   -d  -i  -t  -p 51521:1521     -p 55500:5500     -e ORACLE_PWD=<secret>     -e ORACLE_CHARACTERSET=AL32UTF8     oracle/database:18.4.0-xe /bin/bash

after that I was able to see the results in the docker ps command. but docker logs command is showing nothing.

I have some questions here.

first of-all why the first docker run command was not running and docker logs command showing logs which is quite normal.

secondly why the second command is showing all good but docker logs are showing nothing.

and 3rdly the docker images command shows the following out put at my side

REPOSITORY                       TAG         IMAGE ID       CREATED        SIZE
oracle/database                  18.4.0-xe   a347238232be   2 days ago     319MB
oraclelinux                      7-slim      0a28ba78f4c9   7 weeks ago    132MB

but the forums I am following shows the the size which is quite different from my side.

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
oracle/database     18.4.0-xe           926f4349b277        12 minutes ago      5.89GB
oraclelinux         7-slim              153f8d73287e        8 weeks ago         131MB

Need suggesting and help needed here, thanks advance.

Regards,