Merge branch 'gar-ci-vars' into 'master'

Add CI variables for Google Cloud Artifact Registry integration

See merge request !143679



Merged-by: João Pereira <jpereira@gitlab.com>
Approved-by: David Fernandez <dfernandez@gitlab.com>
Approved-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Approved-by: Furkan Ayhan <furkanayhn@gmail.com>
Reviewed-by: Furkan Ayhan <furkanayhn@gmail.com>
Reviewed-by: David Fernandez <dfernandez@gitlab.com>
Reviewed-by: João Pereira <jpereira@gitlab.com>
Reviewed-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Co-authored-by: David Fernandez <dfernandez@gitlab.com>
Co-authored-by: Furkan Ayhan <furkanayhn@gmail.com>
Co-authored-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>