feat: use mastodon version 4.2.1 from our fork

This still needs updates in the NixOS module to account for the changes
in https://github.com/mastodon/mastodon/pull/24655 that change how
multiple streaming processes run. Hopefully this is fine for a single
streaming process though.

https://github.com/NixOS/nixpkgs/pull/251950
https://github.com/teutat3s/nixpkgs/tree/mastodon-4.2.1

flake.lock

@@ -150,6 +150,22 @@
         "type": "github"
       }
     },
+    "mastodon-fork": {
+      "locked": {
+        "lastModified": 1698490885,
+        "narHash": "sha256-Ic2YgJ7vlAoiihho4pJgHewIubIZQpv1L8ePRB1wfG4=",
+        "owner": "teutat3s",
+        "repo": "nixpkgs",
+        "rev": "534d90c65614f05e543fd11b3f4acd748704a625",
+        "type": "github"
+      },
+      "original": {
+        "owner": "teutat3s",
+        "ref": "mastodon-4.2.1",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nix-darwin": {
       "inputs": {
         "nixpkgs": [
@@ -226,6 +242,7 @@
         "deploy-rs": "deploy-rs",
         "flake-parts": "flake-parts",
         "home-manager": "home-manager",
+        "mastodon-fork": "mastodon-fork",
         "nix-darwin": "nix-darwin",
         "nixos-flake": "nixos-flake",
         "nixpkgs": "nixpkgs",

flake.nix

@@ -3,6 +3,7 @@
     # Track channels with commits tested and built by hydra
     nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
     unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+    mastodon-fork.url = "github:teutat3s/nixpkgs/mastodon-4.2.1";
 
     nix-darwin.url = "github:lnl7/nix-darwin/master";
     nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
@@ -34,6 +35,7 @@
         # ./terraform.nix
         ./public-keys
         ./lib
+        ./overlays
       ];
 
       perSystem = { system, pkgs, config, ... }: {
@@ -79,6 +81,7 @@
                 self.pub-solar.lib.linux.unlockZFSOnBoot
                 self.nixosModules.home-manager
                 self.nixosModules.linux
+                self.nixosModules.overlays
                 inputs.agenix.nixosModules.default
                 {
                   home-manager.users.${username} = {

hosts/nachtigall/apps/mastodon.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, flake, ... }:
+{ config, pkgs, flake, inputs, ... }:
 
 {
   age.secrets."mastodon-secret-key-base" = {

overlays/default.nix

@@ -0,0 +1,17 @@
+{
+  self,
+  inputs,
+  ...
+}: {
+  flake = {
+    nixosModules = rec {
+      overlays = ({ ... }: {
+        nixpkgs.overlays = [
+          (final: prev: {
+            mastodon = inputs.mastodon-fork.legacyPackages.${prev.system}.mastodon;
+          })
+        ];
+      });
+    };
+  };
+}