Migrate shell alias for TYPO3 git push to custom command

To streamline the setup, as other things are also commands instead of
aliases.

home/home.nix

@@ -101,8 +101,6 @@ in {
       # Tmux outside tmux.
       ta = "tmux attach";
       tc = "tmux new-session -s ";
-
-      t3Push = "git push origin HEAD:refs/for/main";
     };
 
     enableNixpkgsReleaseCheck = true;

home/packages/custom/default.nix

@@ -10,6 +10,7 @@
   (callPackage ./nextcloud-sync/from-remote.nix { })
   (callPackage ./typo3-documentation-rendering { })
   (callPackage ./typo3-documentation-rendering-old { })
+  (callPackage ./typo3-push-core { })
   (callPackage ./zcat-progress { })
   (callPackage ./project {
     inherit ownLib;

home/packages/custom/typo3-push-core/default.nix

@@ -0,0 +1,11 @@
+{
+  writeShellApplication
+}:
+
+writeShellApplication {
+  name = "custom-typo3-push-core";
+
+  text = ''
+    git push origin HEAD:refs/for/main
+  '';
+}