Bundle required shared libraries in Linux CI pipelines

Add libz, libpng, libzip to Dockerfile.linux Docker build library copy loop. Simplify release.yml to use distrib-stage output (which now auto-bundles all deps via package_linux.sh) instead of manually listing libraries.

Author: eddoww

.github/workflows/release.yml

@@ -270,25 +270,6 @@ jobs:
           strip bin/moac
           strip bin/libastonia_net.so
 
-      - name: Collect Binaries (Linux)
-        run: |
-          mkdir -p binaries
-          cp bin/moac binaries/
-          cp bin/libastonia_net.so binaries/
-          cp -L /usr/local/lib/libSDL3.so.0 binaries/ 2>/dev/null || \
-            cp -L /tmp/sdl3-install/lib/libSDL3.so.0 binaries/ || true
-          cp -L /usr/local/lib/libSDL3_mixer.so.0 binaries/ 2>/dev/null || \
-            cp -L /tmp/sdl3-install/lib/libSDL3_mixer.so.0 binaries/ || true
-          echo "=== Linux Binaries ==="
-          ls -la binaries/
-
-      - name: Upload Binaries (Linux)
-        uses: actions/upload-artifact@v4
-        with:
-          name: linux-binaries
-          path: binaries/
-          retention-days: 7
-
       - name: Prepare distribution staging
         run: make distrib-stage
 
@@ -298,6 +279,7 @@ jobs:
           name: linux-staging
           path: distrib/linux_client/
           retention-days: 7
+          overwrite: true
 
   build-windows-release:
     needs: build-sdl3-windows
@@ -375,13 +357,7 @@ jobs:
           name: windows-staging
           path: distrib/windows_client/
           retention-days: 7
-
-      - name: Upload Binaries (Windows)
-        uses: actions/upload-artifact@v4
-        with:
-          name: windows-binaries
-          path: distrib/windows_client/bin/
-          retention-days: 7
+          overwrite: true
 
       - name: Upload Mod SDK (Windows)
         uses: actions/upload-artifact@v4
@@ -627,18 +603,6 @@ jobs:
           name: mod-sdk-windows
           path: mod-sdk
 
-      - name: Download Linux Binaries
-        uses: actions/download-artifact@v4
-        with:
-          name: linux-binaries
-          path: linux-binaries
-
-      - name: Download Windows Binaries
-        uses: actions/download-artifact@v4
-        with:
-          name: windows-binaries
-          path: windows-binaries
-
       - name: Download macOS Binaries
         uses: actions/download-artifact@v4
         with:
@@ -656,8 +620,8 @@ jobs:
           tar czf client-linux.tar.gz linux_client
           zip -q -r client-windows.zip windows_client
           zip -q -r mod-sdk.zip mod-sdk
-          tar czf client-linux-binaries.tar.gz -C linux-binaries .
-          cd windows-binaries && zip -q -r ../client-windows-binaries.zip . && cd ..
+          tar czf client-linux-binaries.tar.gz -C linux_client/bin .
+          cd windows_client/bin && zip -q -r ../../client-windows-binaries.zip . && cd ../..
           tar czf client-macos-binaries.tar.gz -C macos-binaries .
 
       - name: Generate checksums

build/containers/Dockerfile.linux

@@ -73,7 +73,7 @@ rm -f build.zig\n\
 \n\
 # Copy required shared libraries into bin/ for portable deployment\n\
 # The binary already has $ORIGIN rpath set, so it will find .so files next to itself\n\
-for lib in libSDL3.so libSDL3_mixer.so libmimalloc.so; do\n\
+for lib in libSDL3.so libSDL3_mixer.so libmimalloc.so libz.so libpng.so libpng16.so libzip.so; do\n\
     for dir in /usr/lib /usr/local/lib; do\n\
         if [ -f "$dir/$lib" ]; then\n\
             cp -L "$dir/$lib"* /app/bin/ 2>/dev/null || true\n\