Minimise rate limiting

[domoscargin]

Investigate whether we can:

• reduce API calls
• set concurrency limits
• other

[domoscargin]

We can investigate the graphQL API to collect more data in one call.

Something like:

  const query = `
    query($owner: String!, $name: String!) {
      repository(owner: $owner, name: $name) {
        createdAt
        pushedAt
        object(expression: "HEAD:package.json") {
          ... on Blob {
            text
          }
        }
        packageLock: object(expression: "HEAD:package-lock.json") {
          ... on Blob {
            text
          }
        }
        yarnLock: object(expression: "HEAD:yarn.lock") {
          ... on Blob {
            text
          }
        }
      }
    }
  `

would get the repo metadata, and the package file in one go. (I don't know GraphQL...)