BIT-58: Add Github Actions workflow for building and testing

[matt-livefront]

🎟️ Tracking

BIT-58

🚧 Type of change

• 🤖 Build/deploy pipeline (DevOps)

📔 Objective

Adds a GitHub actions workflow for building and testing the app. This workflow will comment back on the PR with any warnings or errors and test coverage.

📋 Code changes

• .github/workflows/test.yml: A workflow file to build and test the app and report warnings/errors and test coverage.
• Dangerfile: Configuration file for Danger. Danger is a ruby gem which allows for adding plugins that can comment on a PR. Here we're using danger-slather to report on code coverage and danger-xcode_summary to report on any build warnings or errors.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

	1 Warning
⚠️	Total coverage less than 80%

Code coverage

Total coverage: 48.18%

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[withinfocus]

Would be good to wait on @bitwarden/dept-devops for a review as well.

[nathan-livefront]

🙌