Add dummy backend

[6543]

create a pipeline backend to mock exec for integration testing

TODO:

• document mock backend in development docs
  -> https://woodpecker-ci-woodpecker-pr-3820.surge.sh/docs/next/development/testing

close #3503

[6543]

mock found already first error 🗡️

build and use cli exec with this config:

steps:
  - name: echo
    image: dummy
    commands: echo ja

we get:

8:38PM DBG cli/common/hooks.go:38 > Checking for updates ...
8:38PM DBG cli/update/updater.go:25 > Current version: next-1f21033432
8:38PM DBG cli/update/updater.go:28 > Skipping update check for development & next versions
8:38PM DBG cli/common/hooks.go:49 > No update required
8:38PM FTL cmd/cli/main.go:27 > error running cli error="[bad_habit] Please set an event filter for all steps or the whole workflow on all items of the when block"

I expect the cli to not fail just lock the error - as error type is bad_habit

[6543]

if we would have this framework merged ... the bugfix for #3821 could add an regression test for this exact case ...

[woodpecker-bot]

Deployment of preview was torn down

[6543]

@anbraten with this we could in the long term also catch ui glitches like: https://cloud.obermui.de/s/gcZfzD7SDLxBs6i/download/vid-20240622-220313.mkv

(in the main branch, we don't get notivied via eventstream when services are stoped ...)

[6543]

[codecov]

Codecov Report

Attention: Patch coverage is 73.38129% with 37 lines in your changes missing coverage. Please review.

Project coverage is 28.35%. Comparing base (b8b6efb) to head (bc821eb).
Report is 6 commits behind head on main.

❗ Current head bc821eb differs from pull request most recent head 98ae630

Please upload reports for the commit 98ae630 to get more accurate results.

Files	Patch %	Lines
pipeline/backend/dummy/dummy.go	74.45%	27 Missing and 8 partials ⚠️
cli/exec/exec.go	0.00%	1 Missing ⚠️
cmd/agent/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3820      +/-   ##
==========================================
+ Coverage   28.25%   28.35%   +0.10%     
==========================================
  Files         363      364       +1     
  Lines       25114    25213      +99     
==========================================
+ Hits         7095     7149      +54     
- Misses      17486    17531      +45     
  Partials      533      533              

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[qwerty287]

Adding testing stuff into production binaries isn't a good idea I'd say.

Would it be possible to use a go build flag to define whether you want to have this included?

[6543]

Well I personally do see value in have it shipped in the normal cli and agent binarys ... but as of now if i realy would need it i can compile stuff myselfe.

will do ...

[anbraten]

thanks for the adjustments