WIP: move constrain to only have a single command in backend to run to dedicated backends

[6543]

at the moment we compile a script that we can pipe in as single command this is because of the constrains the docker backend gives us.

so we move it into the docker backend and eventually get rid of it altogether

[anbraten]

Sounds nice. My idea for the docker backend was to run each command step with docker exec instead of using the script and executing it via docker run once. This would allow us to change the entrypoint as well: #278

[codecov-commenter]

Codecov Report

Base: 45.08% // Head: 44.93% // Decreases project coverage by -0.14% :warning:

Coverage data is based on head (c7b4413) compared to base (280d27d). Patch coverage: 2.12% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1032      +/-   ##
==========================================
- Coverage   45.08%   44.93%   -0.15%     
==========================================
  Files         138      138              
  Lines        9988     9959      -29     
==========================================
- Hits         4503     4475      -28     
- Misses       5209     5211       +2     
+ Partials      276      273       -3     

Impacted Files	Coverage Δ
pipeline/backend/common/script.go	0.00% <0.00%> (ø)
pipeline/backend/common/script_posix.go	100.00% <ø> (ø)
pipeline/backend/common/script_win.go	0.00% <ø> (ø)
pipeline/backend/docker/convert.go	8.59% <0.00%> (-0.14%)	:arrow_down:
pipeline/backend/docker/docker.go	0.00% <ø> (ø)
pipeline/backend/kubernetes/pod.go	0.00% <0.00%> (ø)
pipeline/frontend/yaml/compiler/convert.go	0.00% <0.00%> (ø)
pipeline/frontend/yaml/linter/linter.go	74.71% <ø> (+0.42%)	:arrow_up:
pipeline/frontend/yaml/container.go	82.35% <100.00%> (ø)
server/queue/fifo.go	83.13% <0.00%> (-3.62%)	:arrow_down:
... and 3 more

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[6543]

Sounds nice. My idea for the docker backend was to run each command step with docker exec instead of using the script and executing it via docker run once. This would allow us to change the entrypoint as well: #278

that can be next ... (and yes i had this also in mind ... and less overhead)

[woodpecker-bot]

Deployment of preview was successful: https://woodpecker-ci-woodpecker-pr-1032.surge.sh

[gapodo]

After the changes put in via 30f113f it's working on Kubernetes with the Kubernetes backend active https://test-ci.kle.li/sandbox/sq-test/pipeline/10/3 thanks again for the patience while I was stumbling through the setup

[6543]

ok now it's just a refactor and do not change any behavior at all