Unknown time zone error with hugo plugin

I’m trying to use the drone plugin for hugo to deploy my website automatically and use the configuration in the docs, but I keep getting this error:

latest: Pulling from plugins/hugo
Digest: sha256:c41c437b26c2b587bd32137e3d6bba3544f92a79b4992a9b3680437ee1ec3970
Status: Image is up to date for plugins/hugo:latest
+ /tmp/401314049/852269676 check
Contains some verification checks

+ /tmp/401314049/852269676 --baseURL https://mydomain.de/
Error: invalid timeZone for language "en": unknown time zone Europe/Berlin
Total in 1 ms
exit status 255

Is there something I’m doing wrong?

My Config is down below.

config.toml:

languageCode = 'en-us'
timeZone = 'Europe/Berlin'

.drone.yml:

kind: pipeline
name: default

steps:
- name: build
  image: plugins/hugo
  settings:
    hugo_version: 0.92.0
    pull: always
    url: https://mydomain.de/
    validate: true
    extended: true

I found what was causing the issue.

Since alpine linux has no tzdata preinstalled, the hugo client couldn’t translate the timezone data in config.toml.
After the installation of the tzdata package hugo was able to build the site.

apk update
apk add tzdata