add pushing of subfields #824

Job	Run time
build	2m 14s
Julia 1.6 - ubuntu-latest - x64	3m 11s
Julia 1.6 - macOS-latest - x64	3m 36s
Julia 1.6 - windows-latest - x64	13m 58s
Julia 1 - ubuntu-latest - x64	2m 35s
Julia 1 - macOS-latest - x64	3m 46s
Julia 1 - windows-latest - x64	3m 54s
Julia pre - ubuntu-latest - x64	5m 13s
Julia pre - macOS-latest - x64	6m 0s
Julia pre - windows-latest - x64	6m 0s
Julia nightly - ubuntu-latest - x64	5m 3s
Julia nightly - macOS-latest - x64	5m 48s
Julia nightly - windows-latest - x64	6m 18s
	1h 7m 36s

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