Introduce rc channel

default/pacman/mirrorlist-rc

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+Server = https://rc-mirror.omarchy.org/$repo/os/$arch

default/pacman/pacman-rc.conf

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+# See the pacman.conf(5) manpage for option and repository directives
+
+[options]
+Color
+ILoveCandy
+VerbosePkgLists
+HoldPkg = pacman glibc
+Architecture = auto
+CheckSpace
+ParallelDownloads = 5
+DownloadUser = alpm
+
+# By default, pacman accepts packages signed by keys that its local keyring
+# trusts (see pacman-key and its man page), as well as unsigned packages.
+SigLevel = Required DatabaseOptional
+LocalFileSigLevel = Optional
+
+# pacman searches repositories in the order defined here
+[core]
+Include = /etc/pacman.d/mirrorlist
+
+[extra]
+Include = /etc/pacman.d/mirrorlist
+
+[multilib]
+Include = /etc/pacman.d/mirrorlist
+
+[omarchy]
+SigLevel = Optional TrustAll
+Server = https://pkgs.omarchy.org/edge/$arch