Split sandbox images by language

[nygrenh]

• Make tmc langs to tell what image to use
• Publish new images
• Switch tmc-server to use the new images

new image name format: eu.gcr.io/moocfi-public/tmc-sandbox-

Return per-language plugin default sandbox image or tmcproject.yml override from refresh

To all images:

• unzip
• curl
• build-essential
• libssl
• wget
• locale
• locale-all

SET env

ENV LC_ALL en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8

build all tag