Add ensa_version and filesystem_type env docs (#521) #1753

Job	Run time
Rebuild main branch dependencies	3s
Elixir dependencies	19s
Generate project documentation	24s
API bc check (V1)	27s
API bc check (V2)	27s
API bc check (V3)	30s
Static Code Analysis	2m 59s
Test	48s
Commit the RPM package on OBS	2m 10s
Build the docker image for the demo environment	4m 26s
Build and push container images	4m 11s
Commit the container image on OBS	1m 56s
	18m 40s

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