chore: improve documentation of self-hosting using docker / docker-compose

Signed-off-by: moonleay <contact@moonleay.net>

.dockerignore

@@ -1,3 +1,4 @@
 **.nils
 /run
 /run/
+docker-compose.yml

README.md

@@ -33,12 +33,22 @@ More information can be found on the [Homepage](https://liljudd.ink).
 
 ## How to self-host (using the Docker container)
 
-1. Pull the container from [Docker Hub](https://hub.docker.com/repository/docker/limiteddev/liljudd/general)
-2. Map /data/ to a folder on disk
-3. Run the Bot once
-4. follow step 4 and 5 from the JAR section
-5. Run the Bot again
-6. Profit.
+1. Copy the docker-compose.yml file from the repository.
+2. Install docker and docker-compose.
+3. Create a directory called "data" in the same directory as the docker-compose.yml file.
+4. Create a directory called "config" in the same directory as the docker-compose.yml file.
+5. Start the bot once.
+6. After 10 seconds, stop the bot.
+7. Open the config file "credentials.nils" in the config directory.
+8. Put in your credentials.
+    1. token: your Discord bot token
+    2. dbDomain: the domain and port of your postgresql database (e.g.: "postgresql", when using the docker-compose.yml
+       file)
+    3. dbName: the name of the database
+    4. dbUser: the username of the database
+    5. dbPassword: the password to the db user
+9. Start the bot again.
+10. The bot should now be up and running.
 
 ## How to self-host (using the JAR)
 

docker-compose.yml

@@ -0,0 +1,32 @@
+version: "3"
+services:
+  lilJudd:
+    container_name: liljudd
+    image: limiteddev/liljudd:x.x.x
+    deploy:
+      resources:
+        limits:
+          cpus: "1"
+          memory: 1G
+    networks:
+      - traefik
+    restart: unless-stopped
+    volumes:
+      - ./config/liljudd/:/data/
+  postgresql:
+    container_name: postgresql
+    image: postgres:13.3-alpine
+    deploy:
+      resources:
+        limits:
+          cpus: "1"
+          memory: 1G
+    environment:
+      - POSTGRES_USER=liljudd
+      - POSTGRES_PASSWORD=changeme
+      - POSTGRES_DB=liljudd
+    networks:
+      - traefik
+    restart: unless-stopped
+    volumes:
+      - ./data/postgresql/:/var/lib/postgresql/data/