DOCS: Add a gitlab CI pipeline to trigger docsite builds
DOCS: Add a gitlab CI pipeline to trigger docsite builds

Signed-off-by: Jon Oster <c028e198cdfa7ddcce2534d97380150af69d434b@here.com>

advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr