[Spark plugin] Fix environment variable ValueFrom for pod templates #918

Job	Run time
unpack-envvars	1s
Docker Build Images (datacatalog) / build_docker	2m 6s
Docker Build Images (flyteadmin) / build_docker	2m 57s
Docker Build Images (flytecopilot) / build_docker	2m 20s
Docker Build Images (flytepropeller) / build_docker	3m 9s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	2m 41s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	3m 51s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	2m 40s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	4m 9s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	3m 50s
Check Go Generate (datacatalog) / Go Generate	1m 30s
Lint (datacatalog) / Run Lint	2m 48s
Check Go Generate (flytecopilot) / Go Generate	1m 16s
Check Go Generate (flyteadmin) / Go Generate	2m 23s
Lint (flyteadmin) / Run Lint	3m 46s
Check Go Generate (flytepropeller) / Go Generate	2m 35s
Lint (flyteidl) / Run Lint	2m 6s
Lint (flytestdlib) / Run Lint	2m 31s
Lint (flytepropeller) / Run Lint	3m 39s
Unit Tests (datacatalog) / Run Unit Test	2m 53s
Lint (flyteplugins) / Run Lint	3m 11s
Unit Tests (flyteadmin) / Run Unit Test	4m 9s
Unit Tests (flytecopilot) / Run Unit Test	2m 30s
Unit Tests (flyteplugins) / Run Unit Test	3m 53s
Unit Tests (flytepropeller) / Run Unit Test	3m 49s
Unit Tests (flytestdlib) / Run Unit Test	3m 10s
Integration Test (flyteadmin) / Integration tests	6m 40s
	1h 20m 33s

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