Update Pull Requests CI trigger behaviour

[ohbus]

Improve Pull Request trigger behaviour

Why does it need any improvement?

⛔ Reopened Pull Request will not start to build automatically
⛔ Labelling and unlabelling them will not start a build

The Pull Request Builder will now automatically get triggered on the following events:

• opened
• reopened
• synchronize
• labeled
• unlabeled

These additional behaviours will work on top of the existing behaviour of:

✔️ Opening a new Pull Request.
✔️ Pushing a new commit to existing Pull Request.

[ohbus]

Hey @iluwatar Please review this.

[iluwatar]

Thanks @ohbus for this improvement! Since you've done several high quality pull requests already, I'd like to invite you to the core team. Contributor access gives you push access to the repository and makes you able to improve things on your own, review/merge pull requests etc. Of course you'll have my full support where needed. Do you accept?

[ohbus]

Thanks @ohbus for this improvement! Since you've done several high quality pull requests already, I'd like to invite you to the core team. Contributor access gives you push access to the repository and makes you able to improve things on your own, review/merge pull requests etc. Of course you'll have my full support where needed. Do you accept?

Thank you so much for this honour ❤️😄❤️ I'm very delighted to accept your request.

Looking forward to collaborate to make greater things!

[iluwatar]

Invites sent and looking forward to collaborate as well. In addition to Github we can use Gitter for chats.