Improve Codespaces port forwarding (#26400)

README.md

@@ -59,13 +59,13 @@ Mastodon acts as an OAuth2 provider, so 3rd party apps can use the REST and Stre
 
 ## Deployment
 
-### Tech stack:
+### Tech stack
 
 - **Ruby on Rails** powers the REST API and other web pages
 - **React.js** and Redux are used for the dynamic parts of the interface
 - **Node.js** powers the streaming API
 
-### Requirements:
+### Requirements
 
 - **PostgreSQL** 9.5+
 - **Redis** 4+
@@ -74,6 +74,10 @@ Mastodon acts as an OAuth2 provider, so 3rd party apps can use the REST and Stre
 
 The repository includes deployment configurations for **Docker and docker-compose** as well as specific platforms like **Heroku**, **Scalingo**, and **Nanobox**. For Helm charts, reference the [mastodon/chart repository](https://github.com/mastodon/chart). The [**standalone** installation guide](https://docs.joinmastodon.org/admin/install/) is available in the documentation.
 
+## Development
+
+### Vagrant
+
 A **Vagrant** configuration is included for development purposes. To use it, complete the following steps:
 
 - Install Vagrant and Virtualbox
@@ -82,9 +86,11 @@ A **Vagrant** configuration is included for development purposes. To use it, com
 - Run `vagrant ssh -c "cd /vagrant && foreman start"`
 - Open `http://mastodon.local` in your browser
 
+### MacOS
+
 To set up **MacOS** for native development, complete the following steps:
 
-- Install the latest stable Ruby version (use a ruby version manager for easy installation and management of ruby versions)
+- Install the latest stable Ruby version (use a Ruby version manager for easy installation and management of Ruby versions)
 - Run `brew install postgresql@14`
 - Run `brew install redis`
 - Run `brew install imagemagick`
@@ -94,15 +100,27 @@ To set up **MacOS** for native development, complete the following steps:
 - Run `bundle exec rails db:setup` (optionally prepend `RAILS_ENV=development` to target the dev environment)
 - Finally, run `overmind start -f Procfile.dev`
 
-### Getting Started with GitHub Codespaces
+### Docker
 
-To get started, create a codespace for this repository by clicking this 👇
+For development with **Docker**, complete the following steps:
 
-[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=52281283)
+- Install Docker Desktop
+- Run `docker compose -f .devcontainer/docker-compose.yml up -d`
+- Run `docker compose -f .devcontainer/docker-compose.yml exec app .devcontainer/post-create.sh`
+- Finally, run `docker compose -f .devcontainer/docker-compose.yml exec app foreman start -f Procfile.dev`
 
-A codespace will open in a web-based version of Visual Studio Code. The [dev container](.devcontainer/devcontainer.json) is fully configured with the software needed for this project.
+If you are using an IDE with [support for the Development Container specification](https://containers.dev/supporting), it will run the above `docker compose` commands automatically. For **Visual Studio Code** this requires the [Dev Container extension](https://containers.dev/supporting#dev-containers).
 
-**Note**: Dev containers are an open spec that is supported by [GitHub Codespaces](https://github.com/codespaces) and [other tools](https://containers.dev/supporting).
+### GitHub Codespaces
+
+To get you coding in just a few minutes, GitHub Codespaces provides a web-based version of Visual Studio Code and a cloud-hosted development environment fully configured with the software needed for this project..
+
+- Click this button to create a new codespace:<br>
+  [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=52281283&devcontainer_path=.devcontainer%2Fcodespaces%2Fdevcontainer.json)
+- Wait for the environment to build. This will take a few minutes.
+- When the editor is ready, run `foreman start -f Procfile.dev` in the terminal.
+- After a few seconds, a popup will appear with a button labeled _Open in Browser_. This will open Mastodon.
+- On the _Ports_ tab, right click on the “stream” row and select _Port visibility_ → _Public_.
 
 ## Contributing