Run homebrew formula locally in pipeline prior to publish

[tdurk93]

Before releasing our homebrew formula, we should test it locally in the pipeline. This should be done prior to executing secureli-deployment.sh in the pipeline. This is probably best done as a separate step in the pipeline that executes prior to the homebrew formula publish (maybe rename the step Homebrew Formula Generation to Homebrew Formula Publish?)

Acceptance criteria: We build the homebrew formula & run secureli init with the built formula prior to publishing to our tap.

[joe-stafford]

The current formula template requires fetching published tarball from github so local testing of unpublished build cannot be done until homebrew formula can allow it.