As reported by Fritz Mueller on slack, it appears that deploy is unable to recover a failed miniconda installation:
https://ci.lsst.codes/blue/organizations/jenkins/stack-os-matrix/detail/stack-os-matrix/26482/pipeline/
::: Deploying Miniconda3 4.2.12 for MacOSX-x86_64
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ERROR: File or directory already exists: /Users/square/jenkins/workspace/stack-os-matrix/osx.py3/lsstsw/miniconda
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script returned exit code 1
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A possible work around is to remove the $LSSTSW/miniconda directory if the $LSSTSW/miniconda/.deployed lock file is absent.