Ensure build os is passed to functional and conformance tests

Author: shaun-nx

.github/workflows/ci.yml

@@ -289,6 +289,7 @@ jobs:
     with:
       image: ${{ matrix.image }}
       k8s-version: ${{ matrix.k8s-version }}
+      build_os: ${{ matrix.build_os }}
     secrets: inherit
     permissions:
       contents: read
@@ -312,6 +313,7 @@ jobs:
       image: ${{ matrix.image }}
       k8s-version: ${{ matrix.k8s-version }}
       enable-experimental: ${{ matrix.enable-experimental }}
+      build_os: ${{ matrix.build_os }}
       production-release: ${{ inputs.is_production_release == true && (inputs.dry_run == false || inputs.dry_run == null) }}
       release_version: ${{ inputs.release_version }}
     secrets: inherit