Merge branch 'aconrey/helm-chart' into 'master'

feat: add support for extraEnv value in chart

See merge request https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image/-/merge_requests/326



Merged-by: Shinya Maeda <shinya@gitlab.com>
Approved-by: Shinya Maeda <shinya@gitlab.com>
Co-authored-by: Alex Conrey <aconrey@grailbio.com>