ci: disable Docker buildx record upload to fix Create Release job

docker/build-push-action@v6 uploads internal .dockerbuild record
artifacts named after the repository owner. On the gridcoin-community
org these match the gridcoin-* glob used by the Create Release download
step, causing artifact download failures. Set DOCKER_BUILD_RECORD_UPLOAD
to false on the docker-publish job to prevent these artifacts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jamescowens

.github/workflows/cmake_production.yml

@@ -755,6 +755,11 @@ jobs:
     needs: [amd64-native-build, arm64-cross-build]
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/')
+    env:
+      # Prevent docker/build-push-action from uploading .dockerbuild
+      # record artifacts that collide with the gridcoin-* glob in the
+      # Create Release download step.
+      DOCKER_BUILD_RECORD_UPLOAD: false
     permissions:
       contents: read
       packages: write