Add basic Ops overview

OPS.md

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+# Vox Pupuli DevOps
+
+This is an overview of our infrastructure.
+Stuff that's sponsored, or payed by us, is explicitly marked.
+
+
+* [System rules](#system-rules)
+* [Systems](#systems)
+    * [ci01.voxpupu.li](#ci01.voxpupu.li)
+    * [ci02.voxpupu.li](#ci02.voxpupu.li)
+    * [CERN CI runners](#CERN-CI-runners)
+* [Software as a service](#software-as-a-service)
+    * [public mailinglist](#public-mailinglist)
+    * [PMC alias](#PMC-alias)
+    * [internal PMC email addresses](#internal-PMC-email-addresses)
+    * [DNS](#dns)
+    * [Cloudflare](#Cloudflare)
+
+## System rules
+
+* We manage systems via puppet apply and [our controlrepo](https://github.com/voxpupuli/controlrepo)
+* they are all under the `voxpupu.li` domain
+
+## Systems
+
+### ci01.voxpupu.li
+
+* Dedicated X86 server sponsored by [macarne.com](https://macarne.com/).
+* It hosts different CI runners
+
+### ci02.voxpupu.li
+
+* ARM64 VM at [Hetzner](https://hetzner.de/), sponsored by simonhoenscheid
+
+### CERN CI runners
+
+* Different VMs managed and sponsored by CERN
+* Currently configured as runners for the whole [voxpupuli GitHub org](https://github.com/organizations/voxpupuli/settings/actions/runner-groups/4)
+* contact person is straylen
+* For incidents contact `[email protected]`
+
+## Software as a service
+
+Admin access to the services is handled via shared accounts in `puppet_credentials` or via personal accounts.
+Those are explained in the governance.md doc in the PMC section.
+
+### public mailinglist
+
+[groups.io](https://groups.io/g/voxpupuli) runs the `[email protected]` mailinglist.
+
+### PMC alias
+
+`[email protected]` is configured at [mailgun](https://app.mailgun.com/mg/sending/mailing-lists/pmc%40voxpupuli.org?listMembers=%7B%22limit%22%3A10%2C%22searchAddress%22%3A%22%22%2C%22skip%22%3A0%7D).
+
+### internal PMC email addresses
+
+We've two internal email addresses.
+They shouldn't be used publicly.
+They are listed in the `puppet_credentials`.
+Those are payed in advance via our open source collective credit card.
+
+### DNS
+
+Our domain registrar is [INWX](https://www.inwx.de/de).
+We use the nameservers at INWX and Hetzner.
+The domains are payed in advance via our open source collective credit card.
+
+### Cloudflare
+
+We've a cloudflare account.
+It handles our website [voxpupuli.org](https://voxpupuli.org/).
+Requests are forwarded to GitHub pages for [github.com/voxpupuli/voxpupuli.github.io](https://github.com/voxpupuli/voxpupuli.github.io).