feat: add Windows cross-compilation and release artifacts

- Add mkWindowsCraneLib using x86_64-pc-windows-gnu target
- Add mkStreamdWindows using mingw-w64 toolchain for cross-compilation
- Export streamd-windows package from flake
- Add Windows build step and .exe artifact to release workflow

.forgejo/workflows/release.yml

@@ -49,12 +49,17 @@ jobs:
         if: steps.version.outputs.SKIP != 'true'
         run: nix build .#streamd-musl -o result-musl
 
+      - name: Build Windows binary
+        if: steps.version.outputs.SKIP != 'true'
+        run: nix build .#streamd-windows -o result-windows
+
       - name: Prepare release artifacts
         if: steps.version.outputs.SKIP != 'true'
         run: |
           mkdir -p release
           cp result-deb release/streamd_${{ steps.version.outputs.VERSION }}_amd64.deb
           cp result-musl/bin/streamd release/streamd-${{ steps.version.outputs.VERSION }}-linux-x86_64
+          cp result-windows/bin/streamd.exe release/streamd-${{ steps.version.outputs.VERSION }}-windows-x86_64.exe
 
       - name: Create release
         if: steps.version.outputs.SKIP != 'true'

flake.nix

@@ -132,6 +132,38 @@
         in
         craneLib.buildPackage (commonArgs // { inherit cargoArtifacts; });
 
+      mkWindowsCraneLib =
+        system:
+        let
+          pkgs = mkPkgs system;
+          toolchain = pkgs.rust-bin.stable.latest.default.override {
+            targets = [ "x86_64-pc-windows-gnu" ];
+          };
+        in
+        (crane.mkLib pkgs).overrideToolchain toolchain;
+
+      mkStreamdWindows =
+        system:
+        let
+          pkgs = mkPkgs system;
+          pkgsCross = pkgs.pkgsCross.mingwW64;
+          craneLib = mkWindowsCraneLib system;
+          commonArgs = {
+            src = craneLib.path ./.;
+            pname = "streamd";
+            inherit version;
+            strictDeps = true;
+            CARGO_BUILD_TARGET = "x86_64-pc-windows-gnu";
+            CC_x86_64_pc_windows_gnu = "${pkgsCross.stdenv.cc}/bin/x86_64-w64-mingw32-gcc";
+            CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER = "${pkgsCross.stdenv.cc}/bin/x86_64-w64-mingw32-gcc";
+            nativeBuildInputs = [ pkgsCross.stdenv.cc ];
+            buildInputs = [ pkgsCross.windows.pthreads ];
+            doCheck = false;
+          };
+          cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+        in
+        craneLib.buildPackage (commonArgs // { inherit cargoArtifacts; });
+
       mkStreamdDeb =
         system:
         let
@@ -181,9 +213,10 @@
           streamd = mkStreamd system;
           streamd-musl = mkStreamdMusl system;
           streamd-deb = mkStreamdDeb system;
+          streamd-windows = mkStreamdWindows system;
         in
         {
-          inherit streamd streamd-musl streamd-deb;
+          inherit streamd streamd-musl streamd-deb streamd-windows;
           default = streamd;
         }
       );