Changelog upgrade

[sebastianpfischer]

• Changelog should ignore the its own commit (it generates each time: Update changelog to newest version message)
• It should run only on master (reduce the amount of git push -f on branches)
• When a tag is created, it should push the changes on master (see https://github.com/eclipse/kiso-testing/runs/8159339717?check_suite_focus=true occurring for 0.19.1)

[sebastianpfischer]

Changelog should ignore the its own commit (it generates each time: Update changelog to newest version message)

--> DONE

[sebastianpfischer]

It should run only on master (reduce the amount of git push -f on branches)

--> DONE

[sebastianpfischer]

When a tag is created, it should push the changes on master (see https://github.com/eclipse/kiso-testing/runs/8159339717?check_suite_focus=true occurring for 0.19.1)

--> MISSING