feat: Make spark-env.sh configurable #1793

Job	Run time
Run Cargo Udeps	1m 15s
Select target helm repository based on action trigger	1s
Check if committed Helm charts are up to date	35s
Check if committed README is the one we would render from the available parts	21s
Run Cargo Deny (advisories)	36s
Run Cargo Deny (bans licenses sources)	39s
Run Clippy	26s
Run RustDoc	1m 5s
Run Rustfmt	14s
Run Cargo Tests	36s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 0s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 24s
Build and publish manifest list	48s
Run the OpenShift Preflight check on the published images	11s
	26m 12s

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