Staging workflow improvements

[pnewsam]

Description

Currently the github workflows are named somewhat confusingly, given

• release-build-installer.yml: Builds main and publishes versioned builds to S3, overwrites latest
• prod-build-installer.yml: Builds main and publishes to S3, overwrites latest
• staging-build-installer.yml: Builds staging and publishes preview build to S3
• staging-build-installer.yml which builds on staging branch

Screenshots

n/a

Type of change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ⚡ New feature (non-breaking change which adds functionality)
• 🚨 Hotfix (non-breaking change which fixes an issue)
• 📢 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📄 This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked my code and corrected any misspellings