fix: Add sys/select.h compat header for MinGW build (#2158)

* fix: Add sys/select.h compat header for MinGW build

* feat: Add OpenBSD build to GitHub Actions CI

.github/workflows/build-release.yml

@@ -36,6 +36,11 @@ jobs:
             container: debian:13
             target: freebsd
             artifact: skynet-freebsd.zip
+          - platform: openbsd
+            os: ubuntu-latest
+            container: debian:13
+            target: openbsd
+            artifact: skynet-openbsd.zip
 
     container: ${{ matrix.container }}
 
@@ -70,10 +75,9 @@ jobs:
         # Install any additional dependencies if needed
         brew install autoconf automake libtool || true
 
-    - name: Install dependencies (FreeBSD)
-      if: matrix.platform == 'freebsd'
+    - name: Install dependencies (FreeBSD/OpenBSD)
+      if: matrix.platform == 'freebsd' || matrix.platform == 'openbsd'
       run: |
-        # FreeBSD build using standard build tools (cross-compilation compatible)
         apt-get update
         apt-get install -y --no-install-recommends \
           build-essential \
@@ -148,7 +152,7 @@ jobs:
       run: |
         mkdir -p release-assets
         # Copy zip files from artifact directories to release assets
-        for artifact in skynet-windows.zip skynet-linux.zip skynet-macosx.zip skynet-freebsd.zip; do
+        for artifact in skynet-windows.zip skynet-linux.zip skynet-macosx.zip skynet-freebsd.zip skynet-openbsd.zip; do
           if [ -d "artifacts/${artifact}" ]; then
             # The artifacts are already organized, just copy them
             cp -r "artifacts/${artifact}/"* "release-assets/" 2>/dev/null || true