fix: add optional host to docker secret

[jstrachan]

No description provided.

[jenkins-x-bot]

@jstrachan: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pr-build	6dd7ae8	link	/test this

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[jstrachan]

/override pr-build

as it looks like the BDD test is currently broken

[jenkins-x-bot]

@jstrachan: Overrode contexts on behalf of jstrachan: pr-build

In response to this:

/override pr-build

as it looks like the BDD test is currently broken

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[rawlingsj]

/lgtm

[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rawlingsj

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