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Add a README section covering dotenv loading (--env-file), the mapping from settings to environment variables, and precedence between CLI flags, process environment, dotenv files, and defaults. Verified against loadEnvFiles and flag EnvVars in main.go. Fixes amacneil#500
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Summary
Adds a dedicated Environment Variables README section covering:
.envloading from the current working directory--env-filefor one or more alternate dotenv filesmain.goEnvVars)--url, then the variable named by--env(defaultDATABASE_URL)Verified against
loadEnvFilesand urfave/cli flag definitions inmain.go/ tests inmain_test.go.Fixes #500
Test plan
EnvVars:inmain.go.env/--env-filebehavior againstTestLoadEnvFilesTestGetDatabaseUrl