01-dockerfile.txt

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-bionic

WORKDIR /home/

COPY . .

RUN bash ./setup.sh

02-setup.sh

## Update and install some things we should probably have
apt-get update
apt-get install -y \
  curl \
  git \
  gnupg2 \
  jq \
  sudo \
  zsh

## Instsall nvm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash

## Install PowerShell Core
curl -sSL https://raw.githubusercontent.com/PowerShell/PowerShell/master/tools/install-powershell.sh | bash

## Setup and install oh-my-zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
cp -R /root/.oh-my-zsh /home/$USERNAME
cp /root/.zshrc /home/$USERNAME
sed -i -e "s/\/root\/.oh-my-zsh/\/home\/$USERNAME\/.oh-my-zsh/g" /home/$USERNAME/.zshrc
chown -R $USER_UID:$USER_GID /home/$USERNAME/.oh-my-zsh /home/$USERNAME/.zshrc

03-devcontainer.json

{
  ...
  "extensions": [
    "coenraads.bracket-pair-colorizer-2",
    "docsmsft.docs-authoring-pack",
    "donjayamanne.githistory",
    "eamodio.gitlens",
    "editorconfig.editorconfig",
    "github.vscode-pull-request-github",
    "jongrant.csharpsortusings",
    "k--kato.docomment",
    "kreativ-software.csharpextensions",
    "mhutchie.git-graph",
    "ms-dotnettools.csharp",
    "ms-vscode.powershell",
    "ms-vscode.vscode-node-azure-pack",
    "ms-vsliveshare.vsliveshare",
    "vscode-icons-team.vscode-icons",
    "visualstudioexptteam.vscodeintellicode",
    "yzhang.markdown-all-in-one"
  ],
  ...
}

04-dotnet-new.sh

dotnet new console -n Sample.ConsoleApp