cmake: add CPack support for creating binary archives

.github/workflows/emscripten.yml

@@ -18,7 +18,7 @@ jobs:
         run: |
           sudo apt-get -y update
           sudo apt-get install -y ninja-build
-      - name: Configure CMake
+      - name: Configure (CMake)
         run: |
           emcmake cmake -S . -B build \
             -Wdeprecated -Wdev -Werror \
@@ -28,7 +28,7 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release \
             -DCMAKE_INSTALL_PREFIX=prefix \
             -GNinja
-      - name: Build
+      - name: Build (CMake)
         run: cmake --build build/ --verbose
       - name: Run build-time tests
         run: |
@@ -36,10 +36,13 @@ jobs:
           export SDL_TESTS_QUICK=1
           # FIXME: enable Emscripten build time tests
           # ctest -VV --test-dir build/
-      - name: Install
+      - name: Install (CMake)
         run: |
           echo "SDL3_DIR=$(pwd)/prefix" >> $GITHUB_ENV
           cmake --install build/
+      - name: Package (CPack)
+        run: |
+          cmake --build build/ --config Release --target package
       - name: Verify CMake configuration files
         run: |
           emcmake cmake -S cmake/test -B cmake_config_build \
@@ -48,3 +51,8 @@ jobs:
             -DTEST_SHARED=FALSE \
             -DCMAKE_PREFIX_PATH=${{ env.SDL3_DIR }}
           cmake --build cmake_config_build --verbose
+      - uses: actions/upload-artifact@v3
+        with:
+          if-no-files-found: error
+          name: SDL-emscripten
+          path: build/dist/SDL3*