news: Add entry about this authenticated channel

In order to ease distribution of the various machine configurations defined within this
repository, make this repository an authenticated Guix channel.

* .guix-authorizations: Add a single authorized key to start
* .guix-channel: Set various channel details
* news.txt: Provide an initial news item

.guix-authorizations

@@ -0,0 +1,11 @@
+;; -*- mode: scheme; -*-
+
+;; This is the list of OpenPGP keys currently authorized to sign commits in
+;; this repository.
+
+(authorizations
+ (version 0)
+
+ ((;; primary: "F7BD DC6D BBE6 B16B 2C71  1A02 5FAB 9938 E05B FEC8"
+   "F8D5 46F3 AF37 EF53 D1B6  48BE 7B4D EB93 212B 3022"
+   (name "rekahsoft"))))

.guix-channel

@@ -0,0 +1,7 @@
+;; -*- mode: scheme; -*-
+
+(channel
+ (version 0)
+ (directory ".guix")
+ (news-file "news.txt")
+ (url "https://git.rekahsoft.ca/rekahsoft/guix-north-america.git"))

news.txt

@@ -0,0 +1,22 @@
+(channel-news
+ (version 0)
+ (entry (commit "c0979ad86fdf0b403c60d5767328cb862ecc00ef")
+        (title (en "guix-north-america channel with authenticated updates"))
+        (body
+         (en "guix-north-america is now a channel (which primary is used as a means to distributes configuration).
+
+This channel takes advantage of support for authenticated updates in @command{guix pull},
+which protects you from attempts to tamper with this repository and ship malicious code
+instead. To ensure you only receive genuine updates from this channel, you should update your
+@file{~/.config/guix/channels.scm} to include the channel introduction:
+
+@lisp
+(channel
+ (name 'guix-north-america)
+ (url \"https://git.rekahsoft.ca/rekahsoft/guix-north-america\")
+ (INTRODUCTION
+  (make-channel-introduction
+   \"c0979ad86fdf0b403c60d5767328cb862ecc00ef\"
+   (openpgp-fingerprint
+    \"F8D5 46F3 AF37 EF53 D1B6  48BE 7B4D EB93 212B 3022\"))))
+@end lisp "))))