vscode through docker

create a container i.e.

docker run -h sample --name=sample -ti mcr.microsoft.com/dotnet/core/sdk /bin/bash

where -h sample will set hostname (optional) and --name=sample will set the container name (optional)

after container created, thanks to -ti flag, the bash process started, now create a user ( may use the same name of your own local account just to use proposed username when you'll connect from vscode to remote host )

useradd -m -s /bin/bash devel0

note: use bash else /bin/sh will fail for vscode remote host conn parser

set the user pass

passwd devel0

install openssh server

apt update
apt install openssh-server
service ssh start

now, from local vascode click on left bottom green icon and choose "Connect to Host..." then insert the ip address of the container you can retrieve with ip a from the docker container
accept first fingerprint acknowledge of the ssh then enter the password you assigned to the user