Don't reject environment variables whose value contains the = char

[jedisct1]

Change summary

Variables loaded by the env_file parameter in scripts configuration couldn't include the = character (strings.Split would return more than 2 elements and fail).

For example, that made it impossible to reliably pass standard Base64-encoded values.

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Changes to Core Features:

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User Impact

Users can now use environment variable values containing = characters (e.g. Base64-encoded strings) in their env_file without the CLI rejecting them.

Are there any considerations that need to be addressed for release?

None.