Ignore failure in certain steps

[johanvdw]

Clear and concise description of the problem

For specific steps in our pipeline, we want to allow failure, eg overambitious linting or spellchecks, and still make the whole pipeline successful. Alternatively we could probably isolate this check in a separate pipeline and have that fail. But for both cases I could not find a solution.

a similar feature in github actions: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepscontinue-on-error

Looks like it is already supported to run a specific step on failure (or on failure and success), but I'd like my whole pipeline to show up as succesful if this particular step fails https://github.com/woodpecker-ci/woodpecker/blob/master/pipeline/samples/sample_4/pipeline.yml#L20-L21

Suggested solution

allow skipping the exitcode of a specific pipeline step:

add an option on-error/on-failure

 check precommit:
   image: xxx/venv-3.9
   on-error: ignore
   commands:
     - tox -e pre-commit

looks like drone also has a failure:ignore option

Alternative

No response

Additional context

No response

Validations

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• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.