git config user.name and user.email aren't populated in build info yaml when run by github actions

[clpetersonucf]

Currently, building the widget with github actions results in a non-fatal error:

Error: Command failed: git config user.email

In the generateWidgetHash plugin:

Materia-Widget-Dev-Kit/webpack-generate-widget-hash.js

Line 34 in 173ba70

email = execSync('git config user.email').toString()

Looking at older builds, those fields were never populated in the build info yaml, even if the builds are marked as successful. Either the way we grab user.name and user.email needs to change, or the github actions need to be updated to accommodate the issue.