add prompt for deploy env when branch name is unexpected

[ITProKyle]

Summary

When run interactively, Runway will prompt the user when an unexpected branch name is found (e.g. feature/env-prompt). Expected branch names are master those that begin with ENV-. The user has the choice to enter a deploy environment name (y at the prompt) or continue with the branch name (n at the prompt).

The prompt will also only occur during commands that are effected by running as interactive/non-interactive (CI environment variable set).

What Changed

Added

• prompt to optionally provide an explicit deploy environment when git branch name is unexpected (e.g. feature branch) when run interactively

Changed

• some unittest.TestCase tests are now pytest tests