mastodon: install chaos.social theme

hosts/mastodon/default.nix

@@ -34,6 +34,22 @@
     enable = true;
     localDomain = "c3d2.social";
 
+    package = pkgs.mastodon.overrideAttrs (oa: {
+      # install chaos.social theme for eri
+      postPatch =
+        let
+          chaos_social_custom = pkgs.fetchzip {
+            url = "https://github.com/chaossocial/custom/archive/dadb72e258e56a4773d58d242d9fd1048d9560c7.zip";
+            sha256 = "sha256-0yfor0cpPGUZbZHP7RXs5Ls6uNzcXi8Zb3AMaNqPz5s=";
+          };
+        in ''
+          for F in {custom,custom_wide,mastodon-light}.scss ; do
+            cp ${chaos_social_custom}/themes/$F app/javascript/styles/
+          done
+          echo "chaos-social-wide: styles/custom_wide.scss" >> config/themes.yml
+        '';
+    });
+
     smtp = {
       host = "mail.c3d2.de";
       port = 587;