cmake: use build platform from environment

This allows all CI builds to be deemed "official"

Signed-off-by: Seth Flynn <getchoo@tuta.io>

.github/workflows/build.yml

@@ -146,7 +146,9 @@ jobs:
       - name: Run CMake workflow
         env:
           CMAKE_PRESET: ${{ steps.cmake-preset.outputs.preset }}
+
           ARTIFACT_NAME: ${{ matrix.artifact-name }}-Qt6
+          BUILD_PLATFORM: official
         run: |
           cmake --workflow --preset "$CMAKE_PRESET"