Support setting child process environment #3213

Job	Run time
Linters	53s
drenv tests (3.9)	1m 48s
Build image	2m 18s
Golangci Lint (.)	19s
drenv tests (3.10)	1m 30s
Golangci Lint (api)	7s
drenv tests (3.11)	1m 34s
ramenctl tests (3.9)	22s
Golangci Lint (e2e)	13s
Unit tests	2m 27s
ramenctl tests (3.10)	27s
ramenctl tests (3.11)	16s
Check artifacts and operator deployment (1.29.1)	1m 23s
Publish built image	49s
	14m 26s

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