Setup merge automation for this repo

[spiffxp]

I'd like to setup merge automation for this repo. This means:

Use an OWNERS file, /approve, /lgtm to allow people to merge PR's into this repo:

• Create/update an OWNERS_ALIAS file that names the existing teams that have write/admin access to the repo
• Create/update an OWNERS file with approvers based on the write/admin access teams
• Configure prow to turn on the "approval" plugin for this repo
• Configure prow/tide to include this repo in the tide query

/assign

[roberthbailey]

Thanks @spiffxp so much for your help here. This was on my list of todo items, but I hadn't gotten to it yet.