Dockerfile: use python alpine and install dev libs

Otherwise, this doesn't seem to build on arm64

Dockerfile

@@ -1,9 +1,14 @@
 # Basis-Image (kann je nach Python-Version angepasst werden)
-FROM python:3.13-slim
+FROM python:3.13-alpine
 
 # Arbeitsverzeichnis erstellen
 WORKDIR /app
 
+RUN apk update && apk add \
+	python3-dev \
+	gcc \
+	libc-dev
+
 # Requirements in den Container kopieren
 COPY requirements.txt requirements.txt
 

README.md

@@ -48,7 +48,7 @@ docker restart lab-signal-bot-signal-cli-rest-api-1
 
 From host, list signal groups:
 ```
-python list_signal_groups.py --api-url http://localhost:8080/ -i
+python list_signal_groups.py --api-url http://localhost:8081/ -i
 ```
 
 Now, you can set the identifier of the group you want in the config.json:

docker-compose.yml

@@ -5,7 +5,7 @@ services:
       - MODE=json-rpc #supported modes: json-rpc, native, normal
       #- AUTO_RECEIVE_SCHEDULE=0 22 * * * #enable this parameter on demand (see description below)
     ports:
-      - "8080:8080" #map docker port 8080 to host port 8080.
+      - "8081:8080" #map docker port 8080 to host port 8081.
     volumes:
       - "./signal-cli-config:/home/.local/share/signal-cli"
     restart: always