gally

#1228809 [DockerFiles] Add 'yarn cache clean' on front images to reduce the size of these images (saves 2Go)

#1229501 Set explicitly mercure versions

[1.0.x] Update gally/gally-standard hash in the composer.lock

[1.0.x] Update gally/gally-standard hash in the composer.lock

Update gally/gally-standard hash in the composer.lock