add sdcard image generation for aarch64-linux (i.e. rpis)

flake.lock

@@ -56,6 +56,42 @@
         "url": "https://gitlab.muc.ccc.de/muCCC/api"
       }
     },
+    "nixlib": {
+      "locked": {
+        "lastModified": 1636849918,
+        "narHash": "sha256-nzUK6dPcTmNVrgTAC1EOybSMsrcx+QrVPyqRdyKLkjA=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "28a5b0557f14124608db68d3ee1f77e9329e9dd5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "nixos-generators": {
+      "inputs": {
+        "nixlib": "nixlib",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1645800619,
+        "narHash": "sha256-fCamVUDH0+nACV1P/rqtoD4YGon5HhnW3bU/0IjA8qI=",
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "rev": "05773c5d1584cebd5eda41675c3456dcabdef42a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixos-generators",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1644951967,
@@ -76,6 +112,7 @@
       "inputs": {
         "home-manager": "home-manager",
         "muccc-api": "muccc-api",
+        "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs",
         "utils": "utils"
       }

flake.nix

@@ -8,9 +8,13 @@
     muccc-api.inputs.nixpkgs.follows = "nixpkgs";
     home-manager.url = "github:nix-community/home-manager";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
+    nixos-generators = {
+      url = "github:nix-community/nixos-generators";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, utils, muccc-api, home-manager, ... }: let
+  outputs = { self, nixpkgs, utils, muccc-api, home-manager, nixos-generators, ... }: let
     supportedSystems = utils.lib.defaultSystems;
   in utils.lib.eachSystem supportedSystems (system: let
     pkgs = import nixpkgs { inherit system; };
@@ -20,6 +24,11 @@
       packages = with pkgs; [ colmena ];
     };
   }) // {
+    sdimage.aarch64-linux = nixos-generators.nixosGenerate {
+      pkgs = import nixpkgs { system = "aarch64-linux"; };
+      format = "sd-aarch64";
+    };
+  } // {
     colmena = {
       meta = {
         nixpkgs = import nixpkgs { };