How to wrap docker run in bash script

docker_run.sh

#!/bin/bash

# region Load environment variables from .env file
if [ -f .env ]; then
  set -a
  source .env
  set +a
fi
# endregion

# region Handle SIGINT, SIGTERM, and SIGKILL
# Ussage:
# _term [signal] [container]
_term() {
  echo "Caught $1 signal forwarding to docker container $container"
  docker kill -s $1 $container
}

_sigint() {
  _term SIGINT
}

_sigterm() {
  _term SIGTERM
}

_sigkill() {
  _term SIGKILL
}

trap _sigint SIGINT
trap _sigterm SIGTERM
trap _sigkill SIGKILL
# endregion

# region helpers
# State helper
# Ussage:
# status [State]
# Example:
# status Running
function status() {
  docker container inspect -f "{{.State.${1}}}" $container
}

# Container exists
# Ussage:
# exists
function exist() {
  docker container inspect $container > /dev/null 2>&1
}
# endregion

# Here one can put arbitrary set of commands/flags for docker run
container=$(
  docker run -d --rm ${@:1}
)

exist &&
 docker attach --sig-proxy=false $container &&
 exit $(status ExitCode) || exit 1