Fix docker build process and readme

README.md

@@ -5,10 +5,10 @@
 To build the app, compile the docker container.
 
 ```bash
-docker build -t getraenkekasse .
+docker compose build
 ```
 
-To start it you then just have to set up the `docker-compose.yml` and use `docker-compose up -d`.
+To start it you then just have to set up the `docker-compose.yml` and use `docker compose up`.
 
 ## Initialization
 

docker-compose.yml.example

@@ -17,7 +17,6 @@ services:
       timeout: 30s
       retries: 5
   getraenkekasse:
-    image: getraenkekasse
     restart: always
     build:
       context: .