Development container

Development container that can be used with VSCode.

It works on Linux, Windows (WSL2) and OSX.

Requirements

Create the following files and directory on your host if you don't have them:
```
touch ~/.gitconfig ~/.zsh_history
mkdir -p ~/.ssh
```
For OSX hosts: ensure the project directory and your home directory ~ are accessible by Docker.
Open the command palette in Visual Studio Code (CTRL+SHIFT+P).
Select Dev-Containers: Open Folder in Container... and choose the project directory.

For any customization to take effect, you should "rebuild and reopen":

Changes you can make are notably:

Changes to the Docker image in Dockerfile
Changes to VSCode settings and extensions in devcontainer.json.
Change the entrypoint script by adding a bind mount in devcontainer.json of a shell script to /root/.welcome.sh to replace the current welcome script. For example:
```
// Welcome script
{
    "source": "/yourpath/.welcome.sh",
    "target": "/root/.welcome.sh",
    "type": "bind"
},
```
Change the vscode service container configuration either in docker-compose.yml or in devcontainer.json.
Add other services in docker-compose.yml to run together with the development VSCode service container. For example to add a test database:
```
  database:
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: password
```
More options are documented in the devcontainer.json reference.