Change github_id on commit_deployment_statuses to bigint

[pcothenet]

What

• Migrate commit_deployment_statuses.github_id from integer to bigint

Why

• GitHub has outgrown the integer limit for deployments: https://github.com/Shopify/shipit-engine/issues/1311

[pcothenet]

You'd need an actual migration to effect this change. https://github.com/Shopify/shipit-engine/tree/master/db/migrate

Yeah sorry, I bungled my PR 😀

[pcothenet]

I'm fixing the version in db/schema.rb. I'm getting "unwanted" changes to db/schema.rb, so I have to do a bit of cherry-picking.

[casperisfine]

Thank you.