Missing configuration parameters should cause tool to fail fast

[mikouaj]

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Debug Output

N/A

Panic Output

N/A

Steps to Reproduce

1. Run ./gke-policy cluster review command

Expected Behavior

Tool should fail fast as there are no cluster configuration parameters specified.
Contextual (depending on a given command) config validation should happen right after loading the config from cli flags or a file.

Actual Behavior

Tool performs several actions before failing: fetches policies from the default source and parses them.

Reading policy files... [GIT repository: https://github.com/google/gke-policy-automation, branch: main, directory: gke-policies]
Parsing REGO policies...
Error: could not get cluster name: cluster parameters not set

References

N/A