flake: utilize nix-systems for overridable flake systems

nix-systems introduces a brand-new pattern that allows the end user to
add or remove systems from the list of supported systems to the flake

See https://github.com/nix-systems/nix-systems for more details

flake.lock

@@ -1501,6 +1501,7 @@
         "scrollbar-nvim": "scrollbar-nvim",
         "smartcolumn": "smartcolumn",
         "sqls-nvim": "sqls-nvim",
+        "systems": "systems_2",
         "tabular": "tabular",
         "telescope": "telescope",
         "tidalcycles": "tidalcycles",
@@ -1639,6 +1640,21 @@
         "type": "github"
       }
     },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "tabular": {
       "flake": false,
       "locked": {

flake.nix

@@ -7,12 +7,9 @@
     ...
   } @ inputs:
     flake-parts.lib.mkFlake {inherit inputs;} {
-      systems = [
-        "x86_64-linux"
-        "aarch64-linux"
-        "x86_64-darwin"
-        "aarch64-darwin"
-      ];
+      # provide overridable systems
+      # https://github.com/nix-systems/nix-systems
+      systems = import inputs.systems;
 
       imports = [
         # add lib to module args
@@ -55,6 +52,7 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-utils.url = "github:numtide/flake-utils";
+    systems.url = "github:nix-systems/default";
 
     # For generating documentation website
     nmd = {