.env file not being used anymore

[rmsilva1973]

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This issue is a:

• bug report
• request for new sample
• documentation issue or request
• regression (a behavior that used to work and stopped in a new release)

Further info:

On previous versions azure-sdk-for-go-samples used to rely on github.com/gobuffalo/envy to load variables from .env files. But that features has been dropped out.

All references to .env file as a way to setup environment variables should be dropped from the code