chore(kb): revise relevant articles after pihole upgrade

knowledge base/linux/alpine.md

@@ -2,6 +2,7 @@
 
 1. [TL;DR](#tldr)
 1. [Further readings](#further-readings)
+   1. [Sources](#sources)
 
 ## TL;DR
 
@@ -30,12 +31,29 @@ addgroup 'nobody' 'docker'
 # Start services.
 rc-update add 'gitea'
 rc-service 'gitea' start
+
+# Upgrade to a new release branch.
+sed -i'.bak' -e 's/v3.22/v3.23/g' '/etc/apk/repositories' \
+&& apk add --upgrade --update-cache 'apk-tools' \
+&& apk upgrade --available \
+&& reboot
+
+# Update configuration files.
+find '/etc' -name "*.apk-new"
+diff '/etc/init.d/localmount' '/etc/init.d/localmount.apk-new' \
+&& mv -iv '/etc/init.d/localmount.apk-new' '/etc/init.d/localmount'
 ```
 
 ## Further readings
 
+- [Website]
+- [Documentation]
 - [APK]
 
+### Sources
+
+- [Upgrading Alpine Linux to a new release branch]
+
 <!--
   Reference
   ═╬═Time══
@@ -43,3 +61,8 @@ rc-service 'gitea' start
 
 <!-- Knowledge base -->
 [apk]: ../apk.md
+
+<!-- Upstream -->
+[Documentation]: https://wiki.alpinelinux.org/wiki/Main_Page
+[Upgrading Alpine Linux to a new release branch]: https://wiki.alpinelinux.org/wiki/Upgrading_Alpine_Linux_to_a_new_release_branch
+[Website]: https://alpinelinux.org/