You need to install the tzdata
package and then set the enviroment variable TZ
to a timezone. (List with all the timezones)
FROM alpine:latest
RUN apk add --no-cache tzdata
ENV TZ=Europe/Copenhagen
Output
$ docker run --rm alpine date
Tue Aug 31 09:52:08 UTC 2021
$ docker run --rm myimage date
Tue Aug 31 11:52:13 CEST 2021