Problem: windows bundle release script is not complete (#987)

Solution:
- adapt the pieces from cronos

flake.nix

@@ -71,7 +71,7 @@
             --owner=0 --group=0 --mode=u+rw,uga+r --hard-dereference . \
             | gzip -9 > $out
         '';
-        bundle-win-exe = drv: final.callPackage ./nix/bundle-win-exe.nix { cronosd = drv; };
+        bundle-win-exe = drv: final.callPackage ./nix/bundle-win-exe.nix { chain-maind = drv; };
       } // (with final;
         let
           matrix = lib.cartesianProductOfSets {
@@ -94,7 +94,11 @@
                   chain-maind = callPackage ./. {
                     inherit rev network;
                   };
-                  bundle = bundle-exe chain-maind;
+                  bundle =
+                    if stdenv.hostPlatform.isWindows then
+                      bundle-win-exe chain-maind
+                    else
+                      bundle-exe chain-maind;
                 in
                 if pkgtype == "bundle" then
                   bundle

nix/bundle-win-exe.nix

@@ -0,0 +1,35 @@
+{ runCommand
+, windows
+, stdenv
+, rocksdb
+, bzip2
+, lz4
+, snappy
+, zstd
+, zlib
+, chain-maind
+}:
+runCommand "tarball-${chain-maind.name}"
+{
+  # manually enumerate the runtime dependencies of chain-maind on mingwW64
+  deps = [
+    "${rocksdb}/bin/librocksdb-shared.dll"
+    "${snappy}/bin/libsnappy.dll"
+    "${lz4.out}/lib/liblz4.dll"
+    "${bzip2.bin}/bin/libbz2-1.dll"
+    "${zlib}/bin/zlib1.dll"
+    "${zstd.bin}/bin/libzstd.dll"
+    "${windows.mingw_w64_pthreads}/bin/libwinpthread-1.dll"
+    "${windows.mcfgthreads}/bin/mcfgthread-12.dll"
+    "${stdenv.cc.cc}/x86_64-w64-mingw32/lib/libgcc_s_seh-1.dll"
+    "${stdenv.cc.cc}/x86_64-w64-mingw32/lib/libstdc++-6.dll"
+  ];
+} ''
+  mkdir -p $out
+  for so in $deps
+  do
+    cp $so $out/
+  done
+
+  cp ${chain-maind}/bin/${chain-maind.meta.mainProgram} $out/
+''