add operate-first as grafana-operator users

[HubertStefanski]

Description

Relevant issues/tickets

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• This change requires a documentation update
• I have added tests that prove my fix is effective or that my feature works
• I have added a test case that will be used to verify my changes
• Verified independently on a cluster by reviewer

Verification steps

[HubertStefanski]

FYI @pb82 @NissesSenap

@durandom If you'd like, I could also add b4mad here? (we want to show off our users!)

[durandom]

👎 on the B4mad part, since it's just a hobby project that's using services of operate first.
👍 on the Operate First cloud inclusion. cc @quaid