Add Docker image for dev

Author: alxlion

self-hosting/development.md

@@ -4,6 +4,30 @@ If you want to contribute to Claper, you can set up a development environment on
 
 ## Setting up a development environment
 
+### Docker setup
+
+To set up a development environment with Docker, you need to have [Docker](https://docs.docker.com/engine/install/) installed on your machine.
+
+1. **Clone the repo**
+
+```sh
+git clone https://github.com/ClaperCo/Claper.git
+```
+
+2. **Go to the project directory**
+
+```sh
+cd Claper
+```
+
+3. **Run Docker compose**
+
+```sh
+docker compose -f compose.dev.yml up
+```
+
+### Manual setup
+
 To set up a development environment, you need to have the [prerequisites](/self-hosting/prerequisites) installed on your machine.
 
 1. **Clone the repo**
@@ -60,6 +84,8 @@ chmod +x ./dev.sh
 You need a PostgreSQL database running on your machine. You can run it with a Docker container: `docker run -p 5432:5432 -e POSTGRES_PASSWORD=claper -e POSTGRES_USER=claper -e POSTGRES_DB=claper --name claper-db -d postgres:15`.
 :::
 
+---
+
 Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
 
 If you have configured `MAIL` environment variable to `local`, you can access to the mailbox at [`localhost:4000/dev/mailbox`](http://localhost:4000/dev/mailbox).

self-hosting/prerequisites.md

@@ -3,8 +3,8 @@
 You can choose to run Claper directly in your server environment or use Docker to run it in a container. If you decide **not to use Docker**, you need to have the following prerequisites:
 
 - Postgres >= 15
-- Elixir >= 1.16.2
-- Erlang >= 26
+- Elixir = 1.16.2 (OTP 26)
+- Erlang = 26.2.1
 - NPM >= 10
 - NodeJS >= 20
 - Ghostscript >= 10 (for PDF support)