feat: Switch to new shared build system

Author: KyleGospo

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "logomenu@aryan_k"]
 	path = system_files/usr/share/gnome-shell/extensions/logomenu@aryan_k
 	url = https://github.com/frostyard/Logomenu.git
+[submodule "shared-build-scripts"]
+	path = build_files/shared
+	url = https://github.com/frostyard/shared-build-scripts.git

Containerfile

@@ -34,16 +34,7 @@ RUN --mount=type=bind,from=ctx,source=/,target=/ctx \
     --mount=type=cache,dst=/var/log \
     --mount=type=tmpfs,dst=/tmp \
     /ctx/build && \
-    rm -rf \
-        /boot \
-        /home \
-        /root \
-        /srv && \
-    mkdir /boot && \
-    mkdir /root && \
-    mkdir /home && \
-    mkdir /srv && \
-    rm -f /etc/machine-id
+    /ctx/shared/finalize
 
 # DEBUGGING
 # RUN apt update -y && apt install -y whois