migrate watchtower container to alpine

Signed-off-by: szaimen <szaimen@e.mail.de>

Containers/watchtower/Dockerfile

@@ -1,16 +1,9 @@
 # From https://github.com/containrrr/watchtower/blob/main/dockerfiles/Dockerfile.self-contained
 FROM containrrr/watchtower:latest as watchtower
 
-FROM debian:bullseye
-
-RUN set -ex; \
-    \
-    apt-get update; \
-    apt-get install -y --no-install-recommends \
-        ca-certificates \
-    ; \
-    rm -rf /var/lib/apt/lists/*
+FROM alpine:latest
 
+RUN apk add --update --no-cache bash
 COPY --from=watchtower /watchtower /
 
 COPY start.sh /

Containers/watchtower/start.sh

@@ -16,5 +16,4 @@ else
     exit 1
 fi
 
-
 exec "$@"