ci: Fix missing matrix.qt and fix libobs path on Ubuntu

.github/workflows/main.yml

@@ -29,6 +29,7 @@ jobs:
         runner: [ "windows-2022" ]
         name: [ "Windows" ]
         compiler: [ "MSVC", "Clang" ]
+        qt: [ 6 ]
         include:
           - compiler: "MSVC"
             package_name: "windows"
@@ -175,6 +176,7 @@ jobs:
       matrix:
         runner: [ "macos-12" ]
         compiler: [ "Clang" ]
+        qt: [ 6 ]
         include:
           - compiler: "Clang"
             name: "MacOS"
@@ -447,7 +449,7 @@ jobs:
           ${{ env.cmake_generator_platform }} \
           -DPACKAGE_NAME="streamfx-${{ matrix.package_name }}" \
           -DPACKAGE_PREFIX="${{ github.workspace }}/build/package" \
-          -Dlibobs_DIR="${{ github.workspace }}/build/obs/install"
+          -Dlibobs_DIR="/usr/lib/x86_64-linux-gnu/cmake/"
     - name: "Build: Debug"
       continue-on-error: true
       shell: bash