Container build support

flake.nix

@@ -5,6 +5,10 @@
     parts.url = "github:hercules-ci/flake-parts";
   };
   outputs = inputs@{ self, nixpkgs, parts, ... }:
+    let
+      packageName = "sampu";
+      containerPackageName = "${packageName}-container";
+    in
     parts.lib.mkFlake { inherit inputs; } {
       systems = nixpkgs.lib.systems.flakeExposed;
       imports = [ inputs.haskell-flake.flakeModule ];
@@ -22,6 +26,28 @@
           };
         };
 
+        packages.${containerPackageName} = pkgs.dockerTools.buildImage {
+          name = packageName;
+
+          copyToRoot = pkgs.buildEnv {
+            name = "image-root";
+            paths = [ (pkgs.haskell.lib.justStaticExecutables self'.packages.sampu) ];
+            pathsToLink = [ "/bin" ];
+          };
+          tag = "latest";
+          config = {
+            Cmd = [
+              "/bin/sampu"
+            ];
+            WorkingDir = "/app";
+            ExposedPorts = {
+              "3000/tcp" = {};
+            };
+            extraCommands = ''
+            '';
+          };
+        };
+
         packages.default = self'.packages.sampu;
       };
     };