[BXMSPROD-1892] Automated pull request backporting workflow

[lampajr]

JIRA:

https://issues.redhat.com/browse/BXMSPROD-1892

referenced Pull Requests:

• https://github.com/kiegroup/kogito-pipelines/pull/743

Added GitHub workflow to automate pull request backporting:

• create backporting pull requests whenever a pull request (having one or more labels backport-<branch>) is successfully merged.

[mareknovotny]

looks good, Could you please add also a guidance into PR template?

[lampajr]

looks good, Could you please add also a guidance into PR template?

@mareknovotny added guidance here, do you agree? if so I will replicate it on all other repositories

[Ginxo]

I would add a new section about "What's backporting" and create a link to it from "How to backport a pull request to a different branch?" section. The rest LGTM

[lampajr]

I would add a new section about "What's backporting" and create a link to it from "How to backport a pull request to a different branch?" section. The rest LGTM

@Ginxo Instead of adding a new section, wdyt if I directly add a simple definition of what a backporting is inside the How to backport a pull request to a different branch section? I think this way is cleaner and avoid to add too many stuff in the template itself.

Check this https://github.com/kiegroup/drools/pull/4863/files#diff-b2496e80299b8c3150b1944450bd81c622e04e13d15c411d291db0927d75fd6bR108

[Ginxo]

LGTM, just check my proposal