Allow variables to be set to empty string in envFiles #3797
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Summary
We currently have environment variables set to empty such as
SIDEKIQ_PRELOAD=
see issue. This works fine when passing in the variable via task definition but breaks when using environment files.Implementation details
No longer ignore variables that have an empty value.
Testing
Extended existing test to allow empty variables and confirm the variable exists in the returned map when parsing the environment file.
New tests cover the changes: yes
Description for the changelog
Allow variables to be set to the empty string when using environment files
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.