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config :logger, :logger_papertrail_backend,
url: "${PAPERTRAIL_URL}",...
REPLACE_OS_VARS=true bin/my_awesome_project start
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REPLACE_OS_VARS=true вроде как уже не модно...MK
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The problem with REPLACE_OS_VARS is that it’s essentially a hack, and as such had limitations - you could only use the ${VAR} syntax in strings, because otherwise Mix couldn’t evaluate the config. The result is that you could only do “dynamic” configuration with string values, and not values of other types.