Add CI setup

[kadler]

We can add a Jenkins setup from our internal Jenkins, but non-IBMers wouldn't be able to access it. Alternatively we could use TravisCI and mock up nodejs-idb-connector.

[abmusse]

I would like to setup Jenkins so that the our automated tests can be run on incoming PRs.

Hopefully we gain access to an IBM i system that can be reached on the public internet.

[github-actions]

👋 Hi! This issue has been marked stale due to inactivity. If no further activity occurs, it will automatically be closed.

[github-actions]

👋 Hi! This issue has been marked stale due to inactivity. If no further activity occurs, it will automatically be closed.