Bootstrapping the cluster to use flux

This only needs to be done upon creation of the cluster.

This follows flux get-started for github.

Configure your kubectl using your aws credentials.

aws eks update-kubeconfig --name kubernetes-aws--flux-prod

Create/locate a personal access token, Install flux with all controllers on the cluster linked to this repo

export GITHUB_TOKEN=<your-token>

flux bootstrap github --owner=elifesciences --repository=elife-flux-cluster --path=clusters/flux-prod --components-extra=image-reflector-controller,image-automation-controller --read-write-key --branch master

Restore sealed-secret master key from backup