feat(*): initialize new Snix infrastructure

Co-Authored-By: edef <edef@edef.eu>
Co-Authored-by: Ryan Lahfa <raito@lix.systems>
Change-Id: Ica1cda177a236814de900f50a8a61d288f58f519

third_party/lix_forgejo/default.nix

@@ -0,0 +1,18 @@
+# Patches that the Lix core team developed for git.lix.systems
+# Re-applied for git.snix.dev
+{ ... }: {
+  patches = {
+    # Show a link to upstream for a nixos/nix repository.
+    upstream_link = ./upstream-link.patch;
+    # Make it possible not to be notified upon issue creation.
+    # Minimize noise.
+    api_dont_notify = ./api-dont-notify.patch;
+    # Sign in redirection to the OAuth 2 handler.
+    signin_redirect = ./signin-redirect.patch;
+    # Series to make Forgejo more Gerrit compatible. 
+    forgejo_is_now_gerrit_native = ./0001-lix-Make-a-Code-Review-Gerrit-tab.patch;
+    # Modified for our Gerrit instance.
+    forgejo_knows_about_gerrit = ./0002-lix-link-gerrit-cl-and-change-ids.patch;
+  };
+  custom_emojis = ./emojis.txt;
+}