Refresh the Repository Store on webhook events and startup for all installation instances.

[adambraimbridge]

Previously, the application listened to GitHub webhook events and added/removed individual items from a repository_store. However, when filtering by topic it made a call to the GitHub API. This is because the GitHub webhook event data does not include topic values for repositories.

This update makes the application completely refresh the repository_store for all webhook events and startup. This loads the appropriate topic data. Filtering is now based on the repository store, with no requirement to call the GitHub API.

• Removed initialisation functionality and tests
• Added support for multiple GitHub application instances
• Changed index tests to focus on whether it's calling the expected functions
• Changed the repository tests to expect the appropriate GitHub API endpoints are requested
• Output more repository properties (owner, full_name and url)
• Subscribe to and listen for repository webhook events
• Note: Probot doesn't exit, even if you throw an error and call process.exit(1). (See: https://github.com/Financial-Times/tako/issues/75)

[adambraimbridge]

[sjparkinson]

This has my blessing, but only if it gets a description and a gif.

[adambraimbridge]

Thanks Simon ❤️

... yeah, I'll sort out the webhook at https://github.com/organizations/financial-times/settings/apps/tako/permissions