Uncover error raised during cloud upload; add GitHub workflows

Contents (#1)

Fixes

• Log actual exception caught when error is raised during window upload to cloud

Operations

• Replace GitLab config, templates, and workflows with GitHub equivalients
• Add semantic version check workflow
• Add automated release notes workflow
• Run tests on Windows and MacOS (tests previously ran only on Linux)
• Upload code coverage to coverage.io

Testing

• Fix cloud functions tests to work on GitHub by providing credentials as a temporary file