I don't exec into containers enough to have this memorized, but I need to do it enough, so I whipped up this script.

container_exec.sh

#!/bin/bash
ERROR=0

#
#   Default behavior is to run /bin/bash using podman, but if podman isn't installed,
#       it SHOULD try docker
#
COMMAND="/bin/bash"
NAME_SERVICE="https://frightanic.com/goodies_content/docker-names.php"
CONTAINER_ID=""
RUNNER="podman"

if [[ -n "$1" ]]; then
    CONTAINER_ID=$1
else
    ERROR=1
fi

if [[ -n "$2" ]]; then
    COMMAND=$2
fi

if [ "$ERROR" -gt 0 ]; then
    echo "There was an error, I need to know what container to run"
    echo
    echo "Usage:"
    echo -e "\t$0 <CONTAINER_ID> <COMMAND>"
    echo -e "\t<COMMAND> has a default of \"/bin/bash\""
    echo
    exit 1
fi

#
#   Choose between podman or docker, if podman is installed, use that
#       If no podman, assume docker
#

WHICH_PODMAN=$(which podman)
if [[ -z $WHICH_PODMAN ]]; then
    RUNNER="docker"
fi

echo "Grabbing container name from $NAME_SERVICE"
CONTAINER_NAME=$(curl -s $NAME_SERVICE)

if ! [[ $CONTAINER_NAME =~ ^[a-z].*_[a-z].* ]]; then
    echo "We couldn't get the container name from the service, generating a UUID and using that."
    CONTAINER_NAME=$(uuidgen)
fi

#
#   run the container, just in case it has an entrypoint defined
#
echo "Running container \"$CONTAINER_ID\" with Container Name \"$CONTAINER_NAME\" using \"$RUNNER\""
$RUNNER run -d --rm --name $CONTAINER_NAME $CONTAINER_ID 1>/dev/null 2>/dev/null

#
#   If the container DOESN'T have an entry point, it won't be running
#       If it's not running, we just do a docker run.
#
#   I wish I knew of a way to just examine a container with a docker command
#       To tell whether it has an entrypoint or CMD or not :/
#
docker_ps=$($RUNNER ps --all --no-trunc --format='{{json .}}' | jq | grep -i $CONTAINER_NAME)

echo "Execing Command: \"$COMMAND\" using \"$RUNNER\""

if [[ -z $docker_ps ]]; then
    $RUNNER run -ti --rm --name $CONTAINER_NAME $CONTAINER_ID $COMMAND
else
    #
    #   exec the command in the running container
    #
    $RUNNER exec -it $CONTAINER_NAME $COMMAND

    #
    #   stop the container
    #
    echo "Stopping the container \"$CONTAINER_NAME\" using \"$RUNNER\""
    $RUNNER stop $CONTAINER_NAME
fi