feat: nix build enabled

nix build
will put binary into nix store, and symlink to ./result
running with
./result/bin/auth-pocketbase-attempt serve --dir=./pb_data

if i understood migrations correctly, when using as a framework
migrations will be generated as go files, and will be packaged into the binary

flake.nix

@@ -1,23 +1,42 @@
 {
   description = "going to look at the pocketbase apis";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
 
-  outputs = { self, nixpkgs }: {
-    devShell.x86_64-linux = let pkgs = nixpkgs.legacyPackages.x86_64-linux;
-    in pkgs.mkShell {
-      buildInputs = [
-        pkgs.go
-        pkgs.wgo # for restart of project
-        pkgs.semgrep
-        pkgs.gopls
-        pkgs.nodePackages.tailwindcss
-        pkgs.nodePackages.prettier
-        pkgs.gnumake
-      ];
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        pname = "auth-pocketbase-attempt";
+        version = "0.0.1";
+      in rec {
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            pkgs.go
+            pkgs.wgo # for restart of project
+            pkgs.semgrep
+            pkgs.gopls
+            pkgs.nodePackages.tailwindcss
+            pkgs.nodePackages.prettier
+            pkgs.gnumake
+          ];
 
-      shellHook = ''
-        export GOPATH=$PWD/.go
-        export PATH=$GOPATH/bin:$PATH
-      '';
-    };
-  };
+          shellHook = ''
+            export GOPATH=$PWD/.go
+            export PATH=$GOPATH/bin:$PATH
+          '';
+        };
+        packages = rec {
+          auth-pocketbase-attempt = pkgs.buildGoModule {
+            inherit pname version;
+            src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+            vendorHash = "sha256-7B5EkrLpL+P5wipQG5a12hrvXQn/UpYAjrz/DuHmSUQ="; # set to "" when get dependencies in go.mod
+
+            # Adding the Tailwind build step to preBuild
+            preBuild = ''
+              ${pkgs.nodePackages.tailwindcss}/bin/tailwindcss -i pages/input.css -o pages/static/public/out.css
+            '';
+          };
+          default = auth-pocketbase-attempt;
+        };
+      });
 }