Perform read-only splits for the containers

The .gitsplit.yml file contains the configuration to be used by Jérémy
Derussé's docker-gitsplit container.

For usage instructions see https://github.com/jderusse/docker-gitsplit

.gitsplit.yml

@@ -0,0 +1,30 @@
+splits:
+  - prefix: "admin"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Admin.git"
+  - prefix: "clamav"
+    target: "https://${GH_TOKEN}@github.com/Mailu/ClamAV.git"
+  - prefix: "dovecot"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Dovecot.git"
+  - prefix: "fetchmail"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Fetchmail.git"
+  - prefix: "nginx-no-https"
+    target: "https://${GH_TOKEN}@github.com/Mailu/NGINX-no-HTTPS.git"
+  - prefix: "nginx"
+    target: "https://${GH_TOKEN}@github.com/Mailu/NGINX.git"
+  - prefix: "postfix"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Postfix.git"
+  - prefix: "radicale"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Radicale.git"
+  - prefix: "rainloop"
+    target: "https://${GH_TOKEN}@github.com/Mailu/RainLoop.git"
+  - prefix: "rmilter"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Rmilter.git"
+  - prefix: "roundcube"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Roundcube.git"
+  - prefix: "rspamd"
+    target: "https://${GH_TOKEN}@github.com/Mailu/Rspamd.git"
+
+origins:
+  - ^master$
+  - ^stable$
+  - ^\d+\.\d+$

admin/README.md

@@ -0,0 +1,12 @@
+Mailu Admin container
+=====================
+
+This is the web-based administrative interface for the Mailu containerized
+mail server.
+
+Resources
+---------
+
+ * [Report issues](https://github.com/Mailu/Mailu/issues) and
+    [send Pull Requests](https://github.com/Mailu/Mailu/pulls)
+    in the [main Mailu repository](https://github.com/Mailu/Mailu)

dovecot/README.md

@@ -0,0 +1,15 @@
+Mailu Dovecot container
+=====================
+
+Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like
+systems, written with security primarily in mind. It's fast, simple to set
+up, requires no special administration and it uses very little memory.
+ 
+In the Mailu stack it is used as the IMAP/POP frontend service.
+
+Resources
+---------
+
+ * [Report issues](https://github.com/Mailu/Mailu/issues) and
+    [send Pull Requests](https://github.com/Mailu/Mailu/pulls)
+    in the [main Mailu repository](https://github.com/Mailu/Mailu)

nginx/README.md

@@ -11,4 +11,4 @@ Resources
 
  * [Report issues](https://github.com/Mailu/Mailu/issues) and
     [send Pull Requests](https://github.com/Mailu/Mailu/pulls)
-    in the [main Mailu repository](https://github.com/Mailu/Mailu)
+    in the [main Mailu repository](https://github.com/Mailu/Mailu)