USHIFT-1433: pass repo to ostree refs command

[dhellmann]

When creating an alias reference, ostree refs requires a --repo
argument to know where to create the reference.

/assign @pmtk

[openshift-ci-robot]

@dhellmann: This pull request references USHIFT-1433 which is a valid jira issue.

In response to this:

When creating an alias reference, ostree refs requires a --repo
argument to know where to create the reference.

/assign @pmtk

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[pmtk]

/lgtm

[openshift-ci]

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