setenv_file: Set all variables of a `.env` file to the system environment.
Description
Internal function to set environment variables that are
necessary for the database connections with db_connection.
Old function name: `set_env_vars()`.
Usage
setenv_file(env_file)
Value
No return value, called for side effects (see description)
Arguments
env_file
A character. The full path including the file name to
the file containing the environment variable definitions to be loaded.