How to cache npm, yarn, bower and composer into /cache folder in GitLab CI

dockerfile

# NPM: cache
RUN npm config set cache /cache/.npm

# bower: cache
ENV bower_storage__packages /cache/.bower/packages
ENV bower_storage__registry /cache/.bower/registry
ENV bower_storage__links /cache/.bower/links

# YARN cache
RUN yarn config set cache-folder /cache/yarn
RUN yarn cache dir

# Composer: make global packages available for execution
ENV PATH ~/.composer/vendor/bin:${PATH}

# Configure Composer
ENV COMPOSER_CACHE_DIR /cache/composer
ENV COMPOSER_NO_INTERACTION 1

You can do the same for the most of packaging plaforms by overriding environment option in you runner config.

I'm using self-hosted gitlab, and having trouble getting yarn to work with the /cache/yarn directory. Did you do anything special in gitlab ci to make this work?