build: add docker images

nix/wordle-solver-wasm.nix

@@ -1,12 +1,14 @@
 {
   perSystem = {pkgs, ...}: let
     utils = import ./utils.nix;
+    rust-toolchain = utils.rust-toolchain pkgs;
     toolchain-crosspkgs = utils.toolchain-crosspkgs pkgs;
     drv = {
       rustPlatform,
       buildPackages,
       lld,
       name ? "wordle-solver",
+      removeReferencesTo,
       ...
     }:
       rustPlatform.buildRustPackage {
@@ -23,6 +25,7 @@
           buildPackages.stdenv.cc
           lld # Needed for wasm-ld
         ];
+        nativeBuildInputs = [removeReferencesTo];
 
         cargoBuildFlags = [
           "--lib"
@@ -31,17 +34,23 @@
         ];
 
         # Configure rustc for WASM
-        env = {
-          RUSTFLAGS = ''--cfg=web_sys_unstable_apis -C linker=wasm-ld'';
-        };
+        RUSTFLAGS = ''--cfg=web_sys_unstable_apis -C linker=wasm-ld -C strip=debuginfo -C debuginfo=0'';
 
         # Copy the WASM file to the output
         installPhase = ''
           mkdir -p $out/lib
           cp target/wasm32-unknown-unknown/release/*.wasm $out/lib/
+
+          runHook postInstall
+        '';
+
+        # Remove toolchain from closure (store paths are debug artifacts)
+        postInstall = ''
+          remove-references-to -t ${rust-toolchain} $out/lib/*.wasm
         '';
       };
   in {
+    packages.toolchain = rust-toolchain;
     packages.wordle-solver-wasm = toolchain-crosspkgs.callPackage drv {};
   };
 }