1456: Fixed "parameter not set" in api image

[turegjorup]

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Description

Fixed parameter not set error in (os2display) api container

api-1        | /usr/local/bin/docker-entrypoint.sh: line 15: 1: parameter not set
api-1        | + /usr/local/bin/confd --onetime --backend env --confdir /etc/confd

See docker-library/php#953

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• My code is covered by test cases.
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