CI: Use lower case OS identifier for Linux builds

.github/workflows/main.yml

@@ -238,7 +238,7 @@ jobs:
         uses: actions/upload-artifact@v3
         with:
           name: ${{ env.PLUGIN_NAME }}-linux-${{ matrix.arch }}-${{ steps.setup.outputs.commitHash }}
-          path: ${{ github.workspace }}/plugin/release/${{ env.PLUGIN_NAME }}-*-Linux.*
+          path: ${{ github.workspace }}/plugin/release/${{ env.PLUGIN_NAME }}-*-linux.*
 
   windows_build:
     name: 02 - Windows

cmake/ObsPluginHelpers.cmake

@@ -292,6 +292,8 @@ else()
       set(CPACK_PACKAGE_NAME "${CMAKE_PROJECT_NAME}")
       set(CPACK_DEBIAN_PACKAGE_MAINTAINER "${LINUX_MAINTAINER_EMAIL}")
       set(CPACK_PACKAGE_VERSION "${CMAKE_PROJECT_VERSION}")
+      set(CPACK_PACKAGE_FILE_NAME
+          "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}-linux-x86_64")
 
       set(CPACK_GENERATOR "DEB")
       set(CPACK_DEBIAN_PACKAGE_DEPENDS