Add option to ignore failures on steps

[sergiofenoll]

closes #1181 closes #834

Adds ignore_failure to pipeline steps. When it's set to true, if the step fails the following steps continue to execute as if no failure had occurred.

---

failure enums idea:

• fail (default) = if other steps run in parallel, wait for them and then let workflow fail
• cancel = if other steps run in parallel, kill them
• ignore = we mark the step as failed but it wont have any impact

[6543]

first impression looks good

lets let the ci run over itselve ;) and then I'll have a look

[6543]

with shell magic you normaly can ignore errors right now too ... but plugins dont ... and this could be a simplification

In any case if we add it documentation is missing (https://github.com/woodpecker-ci/woodpecker/blob/master/docs/docs/20-usage/20-pipeline-syntax.md)

[6543]

just exec make format and commit changes - we ensure proper code format via ci

[sergiofenoll]

with shell magic you normaly can ignore errors right now too ...

You're right, but at work we wanted a simple equivalent to Drone's failure: ignore, so I wanted to have a try at implementing it :smile:

If the addition is okay as-is I'll try to add the docs tomorrow morning (thanks for mentioning it!)

[6543]

it does only add to pipeline config ... and dont move much code so why not

the only question would be: show error in UI and a ignored lable or not not -> as is now show in ui -> need bit more code (can be added later anyway)

[codecov-commenter]

Codecov Report

Base: 44.74% // Head: 44.75% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (d84a499) compared to base (e901f60). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1219   +/-   ##
=======================================
  Coverage   44.74%   44.75%           
=======================================
  Files         139      139           
  Lines        9910     9919    +9     
=======================================
+ Hits         4434     4439    +5     
- Misses       5197     5201    +4     
  Partials      279      279           

Impacted Files	Coverage Δ
pipeline/frontend/yaml/compiler/convert.go	0.00% <0.00%> (ø)
pipeline/frontend/yaml/container.go	82.35% <ø> (ø)
pipeline/pipeline.go	0.00% <0.00%> (ø)
server/logging/log.go	54.65% <0.00%> (+5.81%)	:arrow_up:

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[woodpecker-bot]

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