Set up cachix as emacs-overlay binary cache

cachix/nix-community.nix

@@ -0,0 +1,8 @@
+{
+  nix = {
+    binaryCaches = [ "https://nix-community.cachix.org" ];
+    binaryCachePublicKeys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+}

configuration.nix

@@ -103,6 +103,7 @@
     ./modules/printing.nix
     ./modules/periodic.nix
     ./modules/power.nix
+    ./modules/cachix.nix
     ./overlays/emacs-overlay.nix
   ];
 

modules/cachix.nix

@@ -0,0 +1,13 @@
+# WARN: this file will get overwritten by $ cachix use <name>
+{ pkgs, lib, ... }:
+
+let
+  folder = ../cachix;
+  toImport = name: value: folder + ("/" + name);
+  filterCaches = key: value: value == "regular" && lib.hasSuffix ".nix" key;
+  imports = lib.mapAttrsToList toImport
+    (lib.filterAttrs filterCaches (builtins.readDir folder));
+in {
+  inherit imports;
+  nix.binaryCaches = [ "https://cache.nixos.org/" ];
+}

modules/software.nix

@@ -37,7 +37,6 @@
     podman-compose
     shellcheck
     shfmt
-    android-studio
     gnumake
     nodePackages.pyright
     black
@@ -75,6 +74,8 @@
     zip
     unzip
     unrar
+    # Overlays
+    cachix
   ];
 
   # Fonts declaration