getshifter/wp-languages repository overview

version: '3.7'
services:
  wp:
    volumes:
      - plugindata:/path/to/wp-content/languages
  plugins:
    image: getshifter/wp-languages:5.6
    volumes:
      - languages:/srv/languages
volumes:
  languages:

FROM getshifter/wp-languages:5.6 as languages
RUN /bin/true

FROM wordpress:latest

... do something ...

COPY --from=languages /srv/languages /path/to/wp-content/languages