add stable-staging branch (fix https://gitlab.manjaro.org/applications/manjaro-architect/-/issues/265)

lib/util.sh

@@ -208,7 +208,7 @@ id_system() {
     check_for_error "system: $SYSTEM, init: $H_INIT nw-client: $NW_CMD"
 
     # evaluate host branch
-    ini system.branch "$(grep -oE -m 1 "unstable|stable|testing" /etc/pacman.d/mirrorlist)"
+    ini system.branch "$(grep -oE -m 1 "stable|stable-staging|testing|unstable" /etc/pacman.d/mirrorlist)"
 }
 
 # If there is an error, display it and go back to main menu. In any case, write to logfile.
@@ -461,9 +461,10 @@ configure_mirrorlist() {
 rank_mirrors() {
     #Choose the branch for mirrorlist
     local branch=""
-    local oldbranch="$(grep -oE -m 1 "unstable|stable|testing" /etc/pacman.d/mirrorlist)"
+    local oldbranch="$(grep -oE -m 1 "stable|stable-staging|testing|unstable" /etc/pacman.d/mirrorlist)"
     branch=$(DIALOG " $_MirrorBranch " --radiolist "\n$_UseSpaceBar\n " 0 0 3 \
             "stable" "-" on \
+            "stable-staging" "-" off \
             "testing" "-" off \
             "unstable" "-" off  3>&1 1>&2 2>&3)
     [[ -z "${branch}" ]] && return 0