GCP bucket backup container

[msheiny]

Adds a new container spec for making GCP bucket backups:

• Takes a source bucket
• Brings that down locally, tars it up
• Uploads that to another bucket with user-provided encryption (a GCP feature)

Note I didn't include a metadata file here cause I'm not building with the build.py scripts in the root. I'm trying something new and wacky.

To test? Well I've been testing locally using something like: podman run --privileged -e GBACKUP_ENV_KEY=$(cat gskey) -v "$(pwd)/gsutil.json:/secret/gcp.key:ro" -v "$(pwd)/bucket_sync.py:/usr/local/bin/bucket_sync.py" -it fpf.local/gsutil_sync:latest gs://stn-fpf-media/media/ gs://k8s-www-backups/stn stnmedia -svc_act_key=/secret/gcp.key

A better thing to do would give this a visual glance over and give a more thorough investigation of the implementation as a kubernetes cron-job

[msheiny]

rebased on e8de354

[conorsch]

Working well, after putting in the corresponding changes in other repos to update the container name. Satisfied with functional review performed locally against dev cluster.

[conorsch]

GitHub is asking for a rebase, so doing that on top of 07b4804833358b1278777f863825fa7b8ddb307a prior to merge.