Update 'Dockerfile'

Dockerfile

@@ -1,11 +1,10 @@
 # Snapraid 12.0
-FROM alpine:latest
+FROM debian:bullseye
 
-RUN apk --update add python3 git smartmontools tzdata && \
+RUN apt update && apt upgrade &&\
-    apk add snapraid --update-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing --allow-untrusted && \
+    apt install python3 git snapraid smartmontools tzdata &&\
     git clone https://github.com/Chronial/snapraid-runner.git /app/snapraid-runner && \
     chmod +x /app/snapraid-runner/snapraid-runner.py && \
-    rm -rf /var/cache/apk/*
 
 RUN echo '0 3 * * * /usr/bin/python3 /app/snapraid-runner/snapraid-runner.py -c /config/snapraid-runner.conf' > /etc/crontabs/root