Quickstart documentation for macOS does not work

[mcalthrop]

Description

Some parts of the Quickstart documentation do not work as described on macOS.

1. Docker instructions

   The command to install Docker on macOS does not work: https://coder.com/docs/tutorials/quickstart#install-and-start-coder

   The error message is "ERROR: Unsupported operating system 'macOS'".

   OS details: macOS 15.6, M3, 36Gb RAM

   

$ curl -sSL https://get.docker.com | sh

# Executing docker install script, commit: bedc5d6b3e782a5e50d3d2a870f5e1f1b5a38d5c

ERROR: Unsupported operating system 'macOS'
Please get Docker Desktop from https://www.docker.com/products/docker-desktop

$ sw_vers
ProductName:		macOS
ProductVersion:		15.6
BuildVersion:		24G84
$ sysctl -a | grep brand
machdep.cpu.brand_string: Apple M3 Pro

2. Assigning your user to the Docker group

   Running the command to assign my user to the Docker group also fails:

$ sudo usermod -aG docker $USER

sudo: usermod: command not found

3. Running newgrp

   I ran the following command to assign my user to the Docker group on macOS:

sudo dscl . create /Groups/docker GroupMembership $USER

Running newgrp fails:

➜  ~ sudo dscl . create /Groups/docker GroupMembership $USER
Password:
➜  ~ newgrp docker

newgrp: docker: bad group name

[mcalthrop]

From what I can see so far, the solutions are, respectively:

1. Install Docker desktop here: https://www.docker.com/products/docker-desktop/
2. Follow these instructions: https://stackoverflow.com/questions/72544896/create-a-docker-group-and-place-my-user-in-it-in-macos
3. not sure yet

[mcalthrop]

Just installing Docker on macOS is proving to be quite a drama...

I've come across this, but haven't yet got any of the suggestions there working:
docker/for-mac#7520

[mcalthrop]

btw, I'm happy to raise a PR to address the issues above – just want to be sure of all the fixes before doing so.