Debug sdl2 in CI

Author: ChillerDragon

.github/workflows/integration.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Prepare
       run: |
         sudo apt-get update -y
-        sudo apt-get install -y shellcheck teeworlds-server
+        sudo apt-get install -y shellcheck teeworlds-server libsdl2-dev
         gem install bundler
         gem install rubocop:1.31.2
         bundle install --jobs 4 --retry 3
@@ -37,6 +37,7 @@ jobs:
         chmod +x DDNet7-headless
         sudo mv DDNet7-headless /usr/local/bin
         rm DDNet7-headless.zip
+        ldd DDNet7-headless
     - name: '[CLIENT] Test sending chat messages'
       run: |
         ./integration_test/run.sh client/chat.rb