Add custom script to push etckeeper state

I'm still on Ubuntu and use etckeeper to track changes to /etc.
This small script will push it to my own Gitea instance as a backup and
online history in case I need it.

home.nix

@@ -41,6 +41,7 @@
     pkgs.networkmanager_dmenu
     pkgs.dmenu-custom-scripts
     pkgs.custom-update-system
+    pkgs.custom-push-etckeeper
     pkgs.dunst
     pkgs.st
     pkgs.ncdu

overlays/custom-push-etckeeper/default.nix

@@ -0,0 +1,17 @@
+self: super:
+
+{
+  custom-push-etckeeper = super.pkgs.writeShellApplication {
+    name = "custom-push-etckeeper";
+
+    text = ''
+      mkdir /tmp/etckeeper
+      cd /tmp/etckeeper
+      sudo cp -r /etc/.git .
+      sudo chown -R daniels:daniels .
+      git push
+      cd /tmp
+      rm -rf /tmp/etckeeper
+    '';
+  };
+}