feat: override private keys w/ env vars #87
Merged
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Closes #85
This PR allows private minter keys to be overridden / set with environment variables instead of the configuration file. This helps move us away from storing our private keys in plain text.
Note: Unfortunately I wasn't able to figure out a way to refactor the same logic into a utility function without making the code more confusing. I'll leave refactoring that for a future update. I do hope to make the logic between cosmos & eth based chains more consistent.