change the way we install sdl

.github/workflows/ci.yml

@@ -9,16 +9,34 @@ jobs:
   test:
     name: Engine tests
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 30
 
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install SDL3
+      # Ubuntu 24.04 does not ship libsdl3-dev; build/install SDL3 from source (cached).
+      - name: Setup SDL3
+        id: sdl
+        uses: libsdl-org/setup-sdl@main
+        with:
+          version: 3-latest
+          install-linux-dependencies: true
+          add-to-environment: true
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Export SDL3 paths for the linker
         run: |
-          sudo apt-get update
+          PREFIX="${{ steps.sdl.outputs.prefix }}"
-          sudo apt-get install -y libsdl3-dev
+          echo "PKG_CONFIG_PATH=${PREFIX}/lib/pkgconfig:${PKG_CONFIG_PATH:-}" >> "$GITHUB_ENV"
+          echo "LIBRARY_PATH=${PREFIX}/lib:${LIBRARY_PATH:-}" >> "$GITHUB_ENV"
+          echo "LD_LIBRARY_PATH=${PREFIX}/lib:${LD_LIBRARY_PATH:-}" >> "$GITHUB_ENV"
+          echo "C_INCLUDE_PATH=${PREFIX}/include:${C_INCLUDE_PATH:-}" >> "$GITHUB_ENV"
+          # Help some linkers find the shared lib without rpath surprises
+          if [ -d "${PREFIX}/lib" ]; then
+            echo "${PREFIX}/lib" | sudo tee /etc/ld.so.conf.d/sdl3-ci.conf >/dev/null
+            sudo ldconfig
+          fi
 
       - name: Setup Odin
         uses: laytan/setup-odin@v2