[infra] Stop blocking nightly builds on source check (#67)

Allow builds to proceed when container-side Git checks cannot inspect the read-only checkout reliably.

Author: vikuznetsov-nvidia

.github/workflows/nightly.yml

@@ -180,7 +180,6 @@ jobs:
             UBUNTU_VERSION=${{ matrix.ubuntu }} \
             BASE_IMAGE="${{ matrix.base_image }}" \
             UBUNTU_PORTS_MIRROR="${{ matrix.ports_mirror }}" \
-            CUVSLAM_REQUIRE_CLEAN_SOURCE=1 \
             EXTRA_CMAKE_ARGS="-DCMAKE_CUDA_ARCHITECTURES=${{ matrix.archs }} ${{ matrix.cmake_options }}" \
             ./scripts/build_cuvslam_in_docker.sh Release ./output