Add WorkspaceSize.environments field #1050

Job	Run time
Docker	25s
Pydantic V1	2m 53s
ubuntu-latest - python 3.8 - Lint	33s
Compatibility	36s
ubuntu-latest - python 3.8 - Type check	44s
ubuntu-latest - python 3.8 - Unit tests	1m 24s
ubuntu-latest - python 3.8 - Doc tests	1m 49s
ubuntu-latest - python 3.8 - Doc tests (B)	1m 47s
ubuntu-latest - python 3.8 - Images	1m 1s
ubuntu-latest - python 3.8 - Jobs	2m 54s
ubuntu-latest - python 3.8 - Experiments	52s
ubuntu-latest - python 3.8 - Datasets	1m 2s
ubuntu-latest - python 3.8 - Sweep example	1m 25s
ubuntu-latest - python 3.8 - Build	35s
ubuntu-latest - python 3.8 - Style	33s
ubuntu-latest - python 3.8 - Docs	42s
Release	0s
	19m 15s

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