[ci] Switch to installing ConstraintGeometry otherwise plugin not found

Author: th-skam

.github/workflows/ci.yml

@@ -74,16 +74,18 @@ jobs:
                   -GNinja \
                   -DCMAKE_PREFIX_PATH=$SOFA_ROOT/lib/cmake;%WORKSPACE_INSTALL_PATH%/lib/cmake \
                   -DCMAKE_BUILD_TYPE=Release \
+                  -DCMAKE_INSTALL_PREFIX=%GITHUB_WORKSPACE%/downstream/ConstraintGeometry/install \
                   .. \
-              && ninja"
+              && ninja install"
           else
             cd downstream/ConstraintGeometry/build
             cmake \
               -GNinja \
               -DCMAKE_PREFIX_PATH="$SOFA_ROOT/lib/cmake;$WORKSPACE_INSTALL_PATH/lib/cmake" \
               -DCMAKE_BUILD_TYPE=Release \
+              -DCMAKE_INSTALL_PREFIX="$GITHUB_WORKSPACE/downstream/ConstraintGeometry/install" \
               ..
-            ninja
+            ninja install
           fi
           
       - name: Sanitize artifact name