Add infrastructure article

dev/infrastructure.rst

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+Syncthing Infrastructure
+========================
+
+This is a list of the infrastructure that powers the Syncthing project.
+Unless otherwise noted, the default is that it's a VM hosted by :user:`calmh`.
+
+GitHub
+------
+
+All repos, issue trackers and binary releases are hosted at `GitHub <https://github.com/syncthing>`__.
+
+Main & Documenatation Websites
+------------------------------
+
+Static HTML, served by Nginx.
+
+- `syncthing.net <https://syncthing.net/>`__ (SmartOS container, 1024 MB)
+- `docs.syncthing.net <http://docs.syncthing.net/>`__ (Sphinx for site generation)
+
+Forum Website
+-------------
+
+Powered by Discourse.
+
+- `forum.syncthing.net <https://forum.syncthing.net/>`__ (Ubuntu Linux, 3072 MB)
+
+Global Discovery Server
+-----------------------
+
+Runs the ``discosrv`` instances for v0.11 and v0.12 and PostgreSQL.
+
+- `announce.syncthing.net <http://announce.syncthing.net/>`__ (Ubuntu Linux, 512 MB)
+- announce-v6.syncthing.net (just an alias)
+
+Usage Reporting Server
+----------------------
+
+Runs the ``ursrv`` instance, PostgreSQL and Nginx.
+
+- `data.syncthing.net <http://data.syncthing.net/>`__ (Ubuntu Linux, 512 MB)
+
+Build Servers, Core and Android
+-------------------------------
+
+Runs Jenkins and does the core and Android builds, Ubuntu Linux.
+
+- `build.syncthing.net <http://build.syncthing.net/>`__ (Ubuntu Linux, 4096 MB)
+- `android.syncthing.net <http://android.syncthing.net/>`__ (Ubuntu Linux, 3072 MB)
+
+OSX and Windows Build Slaves
+----------------------------
+
+Runs Jenkins build slaves and run builds and tests on the Mac and
+Windows operating systems. Hosted by :user:`Zillode`.
+
+APT Server
+----------
+
+Serves the APT repository for Debian/Ubuntu users. Runs Nginx.
+
+- `apt.syncthing.net <http://apt.syncthing.net>`__ (SmartOS container, 256 MB)
+
+Relay Servers
+-------------
+
+Runs the ``relaysrv`` that allows communication between otherwise
+blocked v0.12 clients.
+
+-  `a.relays.syncthing.net <http://a.relays.syncthing.net:22070/status>`__ hosted by :user:`Zillode`
+-  `b.relays.syncthing.net <http://b.relays.syncthing.net:22070/status>`__ hosted by :user:`calmh` (SmartOS container, 256 MB)
+
+Signing Server
+--------------
+
+Signs and uploads the release bundles to Github.
+
+- secure.syncthing.net (SmartOS container, 2048 MB)