Update ci.yml

Author: xLPMG

.github/workflows/ci.yml

@@ -305,6 +305,7 @@ jobs:
           cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
                 -DSTELLARIUM_RELEASE_BUILD=Off \
                 -DENABLE_TESTING=On \
+                -DQt5_DIR=/usr/local/lib/qt5/cmake/Qt5 \
                 "${{ github.workspace }}"
           make -j3
           Xvfb :0 -ac -screen 0 1024x768x24+32 >/dev/null 2>&1 &