allow for hotfixes

this allow to do hotfixes that bypass the normal release flow, but still creates clear tags.

You can toy around with it on https://git.panter.ch/manul/lab/ci-test/

TBD:

• after a hotfix-tag has been created, the pipeline runs, but does not deploy automatically anywhere, because you probably do not want to override the current stage version. But maybe we automatically deploy to prod right away? That would avoid one manual step and by that time you had plenty of oportunities to review what you fixed.

README.md

@@ -68,11 +68,11 @@ So we want to have a new patched version 2.4.4 that will be our new prod :
 
 - create a branch for the hotfix: `git checkout -b 2.4.x v2.4.3
 - do your fixes and commit with a `fix:` commit: `fix: very important bug to hotfix`
-- push this branch to gitlab and create a Merge Request into master
+- push this branch to gitlab
 - this will now trigger a special pipeline where you have your usuall lint/test/build and review deploy.
 - Additionaly this pipeline contains a "create-release"-step. Run this job to create the new hotfix release 2.4.4.
 - this will in turn run a pipeline that let's you deploy it to prod and stage. its not done automatically. Chose the right destination for your hotfix.
-- merge the MR into master to also apply it to master. But make sure to NOT delete the branch
+- pull the branch again locally (if you want to have it in the changelog file) and merge it into master
 - this might lead to conflicts now if the hotfix no longer applies, but that's ok! Maybe it was already fixed in some stage feature.
 
 ### enable staging