Move build script to Nix derivation

.gitignore

@@ -6,8 +6,9 @@
 dist
 generateSealPosts
 
-# Direnv lorri stuff
+# Nix related
 .direnv
+result
 
 # Too many posts, hiding for now
 posts

flake.lock

@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1681482634,
-        "narHash": "sha256-cT/nr3L8khEYZSGp8qqwxFH+/q4/547MfyOdSj6MhBk=",
+        "lastModified": 1690927903,
+        "narHash": "sha256-D5gCaCROnjEKDOel//8TO/pOP87pAEtT0uT8X+0Bj/U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fda0d99c2cbbb5c89d8855d258cb0821bd9113ad",
+        "rev": "bd836ac5e5a7358dea73cb74a013ca32864ccb86",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-22.11",
+        "ref": "nixos-23.05",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -42,11 +42,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1681202837,
-        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
         "type": "github"
       },
       "original": {

flake.nix

@@ -2,7 +2,7 @@
   description = "A Nix flake for a blog-post generating script, written in Haskell, with a seal bent.";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
     utils.url = "github:numtide/flake-utils";
   };
 
@@ -18,18 +18,23 @@
         ]);
       in
       {
+        packages.default = pkgs.runCommand "generateSealPosts" { } ''
+          echo Generating seal posts
+          mkdir -p $out/bin
+          ${ghc'}/bin/ghc                 \
+            -O2                           \
+            -static                       \
+            -o $out/bin/generateSealPosts \
+            ${./generateSealPosts.hs}
+        '';
+
         devShells.default = pkgs.mkShell {
           name = "seal-generator-shell";
-
           buildInputs = with pkgs.haskellPackages;
             [
               ghc'
               hlint
               haskell-language-server
-
-              (pkgs.writeShellScriptBin "build-seal-generator" ''
-                ${ghc'}/bin/ghc -outputdir dist -O2 -static generateSealPosts.hs
-              '')
             ];
         };
       });