Missing TZ data in Docker container

[lirc571]

When running pebble in Docker using the Dockerfile at docker/pebble/linux.Dockerfile, sometimes the request for fetching authorization object produces the error missing Location in call to Time.In from the lines below:

https://github.com/letsencrypt/pebble/blob/b7dddc09eb7051c1ec3838f3771b1647df1288c8/wfe/wfe.go#L2513-L2514

It can be fixed by installing tzdata in the container:

RUN apk --no-cache add tzdata

Not sure why the error only occurs some of the times.