why don't read bashrc?

[dgeelab]

• host
  root@Containerd:/home1/container# nerdctl exec -it sniper1 env
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  TERM=xterm
  HOME=/root

• in container
  [root@sniper sniper]# env
  ABCD=1
  TERM=xterm
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  PWD=/home1/sniper/sniper
  LANG=en_US.UTF-8
  AA1=1
  SHLVL=1
  HOME=/root
  LESSOPEN=||/usr/bin/lesspipe.sh %s
  _=/usr/bin/env

============

root@Containerd:/home1/container# nerdctl exec -it sniper1 ls
a.sh b.sh c.sh ...
=> .bashrc(X), .bash_profile(X), /etc/profile(X), /etc/bashrc(X)

• why not read env file?

i want to 'nerdctl exec -it sniper1 ls' command with env file