Issue #535: Update set-env action to execute manually deploy multidev. (#900)

* Issue #535: Update set-env action to execute manually deploy multidev.

* Issue #535: Use bash -eo pipefail.

* Issue #535: Use bash only, as -eo pipefail is already set internally.

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Co-authored-by: Elvis Moreta <119613952+elvism-lullabot@users.noreply.github.com>
Co-authored-by: Elvis Moreta <elvis.moreta@lullabot.com>
Co-authored-by: David Burns <david@lullabot.com>

Author: 3 people