Nix build improvements (macOS support + image slimming) (#953) #2441

Job	Run time
Decide if Helm charts are pushed to the helm repository based on action trigger	4s
Run Cargo Udeps	3m 8s
Run Cargo Tests	2m 37s
Run Cargo Deny (advisories)	28s
Run Cargo Deny (bans licenses sources)	22s
Run Clippy	58s
Check if committed Helm charts are up to date	2m 3s
Run Rustfmt	15s
Check if committed README is the one we would render from the available parts	25s
Run RustDoc	1m 11s
All tests passed	2s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	11m 3s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 19s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	16s
	34m 52s

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