Switch final Docker stage to alpine and add tzdata

Changed the final Docker image base from golang to alpine and added tzdata to the installed packages. This reduces image size and ensures timezone data is available.

Author: flohoss

docker/dockerfile

@@ -27,8 +27,8 @@ RUN yarn types
 COPY ./web/ ./
 RUN yarn build
 
-FROM golang:${V_GOLANG}-alpine AS final
-RUN apk add --update --no-cache dumb-init && \
+FROM alpine:${V_ALPINE} AS final
+RUN apk add --update --no-cache tzdata dumb-init && \
     rm -rf /tmp/* /var/tmp/* /usr/share/man /var/cache/apk/*
 
 COPY ./config/logo.svg /logo.svg