fix: fix problem with installing `topgrade' package

config/common_modules/bling.yml

@@ -1,5 +1,4 @@
 type: bling
 install:
   - 1password
-  - ublue-update
   - dconf-update-service

config/common_modules/scripts.yml

@@ -1,5 +1,6 @@
 type: script
 scripts:
+  - ublue-update.sh
   - system76-scheduler.sh
   - brave-browser.sh
   - systemwide-themes.sh

config/scripts/ublue-update.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# Tell build process to exit if there are any errors.
+set -euo pipefail
+
+get_config_value() {
+    sed -n '/^'"$1"'=/{s/'"$1"'=//;p}' "$2"
+}
+
+set_config_value() {
+    CURRENT=$(get_config_value "$1" "$3")
+    sed -i 's/'"$1"'='"$CURRENT"'/'"$1"'='"$2"'/g' "$3"
+}
+
+# Check if ublue-os-update-services rpm is installed, these services conflict with ublue-update
+if rpm -q ublue-os-update-services > /dev/null; then
+    rpm-ostree override remove ublue-os-update-services
+fi
+
+# Change the conflicting update policy for rpm-ostreed
+RPM_OSTREE_CONFIG="/etc/rpm-ostreed.conf"
+
+if [[ -f "$RPM_OSTREE_CONFIG" ]]; then
+    if [[ $(get_config_value "AutomaticUpdatePolicy" "$RPM_OSTREE_CONFIG") == "stage" ]]; then
+        set_config_value "AutomaticUpdatePolicy" "none" "$RPM_OSTREE_CONFIG"
+    fi
+fi
+systemctl disable rpm-ostreed-automatic.timer
+# topgrade is REQUIRED by ublue-update to install
+pip install --prefix=/usr topgrade
+rpm-ostree install ublue-update