Launching the Docker Container, Displaying in the Browser

Current state

Below, while watching YouTube videos, we are building an environment for rails using docker.However, the container does not show up.
docker container run-p8000:8000 --name webrick sample/webrick:latest cannot be opened)
しかし However, as far as docker ps-a shows, it seems to be standing up

Create and run the app around 01:07:00

Docker Super Introductory Course Merged | Full Course from scratch (YouTube)

running environment:
M1 Mac Iterms
homebrew
docker git
Each VScode installed
dockerhub logged in

What do you want to do

I want my browser to display http://localhost:8000 and proceed the same way as the YouTube teaching materials.

Actual Error Message

Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: enable to start container process: exec: "."—executable file not found in $PATH:unknown.

Reference image

What you've already tried

I searched the error message and found that there are several solutions, but each approach is different, so I decided that it would be bad to mess with it.